California Ag Network

Tag: Almond

  • Be Careful with Almond Variety-Rootstock Selection

    Almond variety and rootstock selection is a quarter century investment. After choosing which crop type to plant, this is likely the most important decision you will make when planting a new orchard. The difference in results is massive. A poor selection could lead to the orchard failing to establish and needing to be removed or providing sub-standard yield for the life of the orchard. A successful selection could mean your trees are regularly yielding twice as much as a different variety-rootstock combination.

    Variety and rootstock selections are typically thought of separately. Each rootstock is bred or selected to have different strengths and adaptations for different soil types, irrigation volumes, levels of anchorage, and ability to withstand adverse field conditions like nematodes, soil-borne pathogens, and toxic elements. Varieties are selected with self-fertility, pollen-compatibility and timing, marketing classification and price, quality and consistency, disease susceptibility, yield, and other factors in mind. However, evaluating the compatibility of different varieties and rootstocks together is critical to deciding whether a combination will be successful. A well-known nurseryman once said, “It takes 20 years to prove a rootstock”. We would add that it takes even longer to prove a variety, and a variety-rootstock combination. Why is the process as much as 30-40 years to provide growers with a winning variety-rootstock? Regional variety trials take the first 15-20 years but are only testing in three locations across the Central Valley and on only one rootstock per location. Once early adopters then plant the new variety-rootstock combination they become the researcher for another 20 plus years. If the grower decides to plant the same variety-rootstock combination for a second-generation orchard, we know we truly have a winner!

    In the Sacramento Valley, Krymsk®86, a hybrid of peach and Myrobalan plum parentage, is enormously popular due to rock-solid anchorage and a relatively higher tolerance of “wet feet” (flooding or soil saturation) compared to peach seedling rootstocks such as Lovell and Nemaguard. Krymsk® 86 rootstock has only been widely planted for about 15 years: while it consistently lives up to its promise of strong anchorage and strong production potential with many varieties, especially Nonpareil, we are still learning about how it performs with other varieties in different field conditions. In wet springs, Monterey and Butte on Krymsk® 86 rootstocks have demonstrated a higher tendency to have slow, yellow growth, a disorder termed ‘Yellow Curling Leaf’ (YCL). YCL symptoms have also been observed in Monterey on Rootpac®-R (almond x plum) rootstock. Trees with YCL express foliar symptoms similar to the Union Mild Etch (UME) disorder affecting those same varieties and others on the Marianna 2624 plum rootstock with typical symptoms including poor tree growth and yellowing leaves that roll and produce necrotic margins. YCL like UME, occurs mostly in second leaf orchards, although both disorders have been observed on older trees. UME was clearly linked to excess soil moisture in the root zone in wet springs or with over-irrigation resulting in excess soil moisture in late spring/early summer. Under those conditions weak pathogens attacked the small feeder roots, affecting growth, but rarely killing the trees. Affected Krymsk® 86 rooted trees, like those on Marianna 2624 usually recover over time when excessive soil moisture is corrected.

    More recently, some new self-fertile varieties have performed very poorly in the Sacramento Valley when grafted to Krymsk® 86. YCL symptoms for example have shown up in multiple seasons in some orchards – leading to a stunted orchard and the decision by the grower to remove the orchard entirely. Other orchards were removed early in the 2023 season after suffering massive tree losses due to suspected bacterial canker. Our current thinking is that like the UME issues on Marianna rootstock – the problems we are now seeing with certain varieties on Krymsk® 86 may have to do with the plum parentage of Krymsk® 86. Without testing each new variety that breeders produce on Krymsk® 86 over many years, we won’t know which varieties are more likely to have severe problems.

    Low vigor and yellow curled leaf (YCL) symptoms on 2nd leaf Independence® on Krymsk® 86 rootstock. Photos taken July 2, 2021. Photo Credit: Franz Niederholzer.

    Do you have a new variety struggling on Krymsk® 86?

    • Use the pressure chamber and soil moisture monitoring to avoid over-irrigation, which can exacerbate YCL symptoms.
    • Some growers have had success bypassing the rootstock and providing nutrition with foliar applications. However, this is very expensive, unsustainable, and doesn’t correct the fundamental problem for providing long-term nutrition.
    • Have ongoing discussions with your nurseryman, PCA, and farm advisor.
    For future orchards using a new variety:
    • If you have historic almond orchard performance, start your variety selection process with what has performed best previously. Your local farm advisor is a great resource for these variety and rootstock selection conversations.
    • Talk with your processor about what varieties the market wants now and what future trends could look like.
    • Consider rootstocks other than Krymsk® 86 (article and comparison tool / podcast). Self-fertile trees planted on other standard rootstocks without significant plum parentage (e.g. Viking and Atlas) or the more vigorous peach-almond hybrid rootstocks (e.g. Hansen 536, Brights, Nickels, and Titan) have not exhibited the same symptoms as those seen on Krymsk® 86 in the Sacramento Valley.
    • Stay tuned for developments at the UC Butte County almond variety trials (all varieties on Krymsk® 86 rootstock, planted at the CSU Chico University Farm) to help inform your decisions about new almond varieties. — By Luke Milliron, UCCE Orchard Advisor Butte, Glenn, and Tehama Counties; Franz Niederholzer, UCCE Farm Advisor Colusa, Sutter, and Yuba Counties; Katherine Jarvis-Shean, UCCE Orchard Advisor; Sacramento, Solano, and Yolo Counties; Clarissa Reyes, UCCE Orchard Advisor Sutter-Yuba, Butte, and Placer Counties; & Evie Smith, Former UCCE Staff Research Associate, Southern Sacramento Valley

  • USDA California Crop/Weather Report

    Sacramento, Calif., (August 1, 2017) – The weather last week was hot and dry across the State. The summer monsoon across the southwest desert helped trigger some showers across the deserts last week, while additional pockets of moisture found their way into the Sierras and managed to produce a few scattered showers throughout the week. Rainfall was limited to Monday through Thursday across the interior deserts and parts of the central and northern Sierras. A few monsoon showers and thunderstorms dropped up to half an inch of rain in places across the desert, with most areas receiving around a tenth of an inch. A stray thunderstorm near Alturas in the northeastern corner of the State dropped nearly half an inch of rain. Snow cover continued to dissipate across the State; however, some areas of the Lassen Volcanic National Park still had nearly ten feet of snow in some areas.

    Temperature highs were in the 60s to 80s along the coast, 70s to 90s in the mountains, 90s to 100s, in the valley, and 90s to 110s in the desert. Temperature lows were in the 30s to 50s in the mountains, 50s to 60s along the coast, 60s to 70s in the valley, and 60s to 80s in the desert.

    Wheat was harvested for grain and shaft baled for straw. Alfalfa fields were being irrigated, cut, and baled. Corn and sorghum for silage were cultivated and irrigated. The corn silage crop was in various stages of development, from already tasseling to developing ears. Cotton continued to be irrigated, cultivated, and was growing well. Cotton was blooming and forming bolls. Black-eyed beans continued to be irrigated and cultivated.

    Mid-season peach, nectarine, pluot, and plum harvest continued.  Some harvested stone fruit orchards were pruned and topped. Table grapes were harvested and vineyards irrigated. Wine grapes were maturing well.  Valencia orange harvest continued but was winding down due to high temperatures and fruit availability.

    Walnut, almond, and pistachio orchards continued to be irrigated. Mechanical and chemical weed control continued in orchards.  Harvest preparation was underway in almond orchards. Almond harvest began in the warmer regions of Kern County. Pistachios were beginning to split. Navel Orange Worm sprays and fertilizers were applied to pistachios. Walnuts were sizing well.

    In Colusa County, triple digit heat impacted the harvest of vegetables, including processing tomatoes and honeydew melons.  The processing tomato harvest was somewhat erratic, interrupting the smooth flow of ripe tomatoes to the canneries.    The melon packing sheds were affected by the inconsistent flow of fruit.  In San Joaquin County, harvest was ongoing for honeydew melons, watermelons, cantaloupes, onions, and fresh vegetable crops.  Farmers’ Market vegetables continued to be harvested and offered for sale.   In Monterey County, mid-year harvest and production slowed for two weeks.  It was expected to pick back up with more harvesting and preparation for the third or last rotation of the year.  All commodities, lettuces, brassicas, and spinach were in production.  Asparagus was finished and artichokes will pick up again in August.  In Fresno County, harvest continued for both organic and conventional tomatoes with lower yields than expected.  Quality was reported as very good.  Onions, carrots, and lettuce seed were harvested.  Soil was prepared for yellow peppers.  In Tulare County, tomatoes, cucumbers, squash, and peppers were picked by certified producers and sold at the local Farmers’ Markets.  Yellow squash, zucchini, eggplant, Bell peppers, green chili peppers, and cucumbers were harvested and shipped domestically.  Sweet corn harvest continued and was sold at roadside stands and local Farmers’ Markets.  Melons were irrigated and prepared for the upcoming harvest.  In Kings County, the tomato harvest continued with a decent harvest reported.  Tomatoes were sprayed with fungicide and pesticide.

    The decline in nutritional quality of rangeland grasses and forbs continued. Range and dryland pasture conditions across the state were reported as fair to very poor. Wildland fires burned some north state pastures and ranges.  Elevated temperatures continued to impact milk production. Bees were active in melon and sunflower fields.

  • USDA California Crop/Weather Report

    Sacramento, Calif., (July 25, 2017) – Another hot and mostly dry week across the State as a typical summertime weather pattern set up with mid-level ridging over the Great Basin brought dry air into most of the State.  The summer monsoon began to ramp up last week, bringing some much-needed rainfall to parts of the southern and interior deserts. Scattered showers fell on parts of the desert on Tuesday and Wednesday, with most places receiving less than a quarter of an inch. A few isolated sprinkles fell in the central and southern Sierras on Sunday, along with more widespread showers in the southern deserts that dropped an additional quarter inch of rain in most places.

    Hot temperatures continued to melt the snow in the mountains. Mt. Whitney was devoid of snow, while snow still blanketed parts of the Shasta Peak. A few isolated patchy snow fields still existed at elevations over 11,500 feet in the region of the Stanislaus National Forest.

    Temperature highs were in the 60s to 80s along the coast, 70s to 90s in the mountains, 90s to 100s in the valley, and 90s to 110s in the desert. Temperature lows were in the 30s to 50s in the mountains, 50s to 60s along the coast, 60s to 70s in the valley, and 60s to 90s in the desert.

    Barley harvest was completed. Alfalfa fields were being irrigated, cut, and baled. Corn and sorghum for silage were still being cultivated and irrigated. The corn silage crop was in various stages of development, from already tasseling to developing ears. Wheat harvest for grain was completed. Cotton continued to be irrigated, cultivated, and was growing well. Cotton was forming squares and blooming. Black-eyed beans continued to be irrigated and cultivated.

    Mid-season peaches, nectarines, and plums continued to be picked and shipped to both domestic and foreign markets. Stone fruit continued to be exported.  Summer pruning and topping of harvested stone fruit groves were occurring.  Valencia orange harvest continued primarily for the domestic market. Regreening was becoming more common due to the higher temperatures.  Olives continued to develop. Table grape were harvested.  Wine grapes were maturing well and irrigation continued.

    Walnut, almond, and pistachio orchards continued to be irrigated.  Both mechanical and chemical weed control continued in orchards.  New almond orchards were planted. Pistachios were fertilized.  Walnuts were sizing well.

    In Colusa County, the processing tomato harvest continued.  In San Joaquin County, harvest was ongoing for cantaloupes, honeydew melons, watermelons, and fresh vegetable crops.  The second planting of cantaloupe was underway for late summer and fall harvest.   In Fresno County, harvest continued for tomatoes with lower yields than expected. Onions and garlic were harvested.  Onion seed was dried.  In Tulare County, tomatoes, cucumbers, squash, and peppers were picked by certified producers and sold at the local Farmers’ Markets.  Yellow squash, zucchini, eggplant, Bell peppers, green chili peppers, and cucumbers were harvested and shipped domestically.  Sweet corn harvest continued and was sold at roadside stands and local Farmers’ Markets.  Melons were irrigated and prepared for the upcoming harvest.

    Low elevation rangeland continued as dry with conditions as fair to good, but quality continued to decrease.  Cattle were moved to higher elevations; where higher elevations were providing more grass than in previous years.  Feed cost for cattle remained high.  Nursery shipments were slowing overall.  Wholesale nursery shipments to Canada and domestic markets decreased due to the hot summer temperatures.  Small amounts of citrus nursery stock continued to be sold.

  • California Almond Crop Projected to Increase 5.1 Percent

    MODESTO, Calif., July 6, 2017 – This year’s California almond crop is forecasted to exceed 2 billion pounds, according to the California Almond Objective Measurement Report announced today by United States Department of Agriculture (USDA) National Agricultural Statistics Service — Pacific Regional Office (NASS/PRO).

    Based on 1 million bearing acres, the objective forecast for the 2017 crop is 2.25 billion meat pounds. Almond Board of California funds the annual forecast administered by USDA National Agricultural Statistics Service.

    Following the Subjective Forecast each year, the Objective Report is the second and final forecast of almond production, providing almond growers and handlers information about the projected harvest size to direct business decisions for the year.

    “Almond trees thrive in our state because California is home to the world’s most efficient almond growers, who continually improve farming practices through research and innovation,” said Richard Waycott, ABC president and CEO, in response to the announcement. “It’s one of the few places on earth with a Mediterranean climate perfect for growing them, so it’s no wonder we’ve been successfully growing them here for over 150 years.”

    The National Agriculture Statistics Service said the latest crop forecast is up 2.3 percent compared to the May subjective forecast of 2.2 billion pounds. The estimate is up 5.1 percent from the 2016 crop production of 2.14 billion meat pounds.

    The average nut set per tree is 5,714, down 7.2 percent from the 2016 almond crop. The Nonpareil average nut set is 5,717 up 2.4 percent compared to last year’s set. The average kernel weight for all varieties sampled was 1.57 grams, up 6.1 percent compared to the 2016 average weight of 1.48 grams.

  • What we can Learn from the Australian Almond Industry

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    At the Annual Convention of the Almond Alliance of California, Karen Lapsley from the Almond Board of California gave a presentation on Almond Alliance funded research improvements in almond biomass utilization. She noted some new varieties coming out of Australia that could be beneficial to California growers, and invited growers to attend the Almond Board’s upcoming almond food quality & safety symposium. Watch her interview now, and read more in the coming issue of Pacific Nut Producer Magazine.

  • USDA California Crop/Weather Report

    Sacramento, Calif., (March 7, 2017) – A lot of variation in the weather across the State as a departing Pacific system exerted its influence onto the State. Monday, heavy rainfall across the southern quarter of the State, with areas along the immediate coast receiving up to two inches of rain. Heavier rainfall fell in the coastal mountains immediately inland of the San Diego area, with locations receiving over five inches. Most of the deserts received a quarter inch of rain. Midweek was mostly dry, expect for light rainfall in a few southern coastal areas. By Friday, the next storm system arrived, with light showers falling on the northwestern mountains. Saturday and Sunday brought heavier precipitation, with up to one to two inches falling in the northern portion of the State, and up to one inch falling in the southern parts of the state outside of the deserts. Light snow was reported in the central Sierras on Monday before warming temperatures mid-week resulted in the first significant snowmelt of the season. Heavy snowfall returned by Saturday with twelve to eighteen inches of snow falling in the central and northern Sierras. Further south, three to six inches of new snowfall occurred, maintaining the pre-week snowpack level there. Mountain snowpacks continued to be very heavy with Lodgepole in the southern Sierras and the Tahoe area reporting snowcover of nearly seven feet.

    Temperature highs were in the 30s to 40s in the mountains, 40 to 80s in the desert, 50s to 70s in the valley, and 60s to 70s along the coast. The temperature lows were in the 10s to 20s in the mountains, 20s to 40s in the valley, 30s to 50s in the desert, and 40s to 50s along the coast.

    Growers continued to wait for fields to dry out sufficiently to resume planting winter grain and field crops. Reports of lodging in mature wheat fields due to the recent high winds and rain of last week. Alfalfa fields were flooded and recharging underground water.

    Pruning, discing, weed control, and pre-bloom spraying continued where dry orchard floor conditions permitted. Olive groves were pruned. Pruning, tying, berm sanitation, and brush shredding continued as vineyard floors dried. Herbicides were applied in some vineyards. Early varieties of stone fruit, including cherries were blooming in Tulare County. Citrus harvest continued. Recent rains impacted the overall quality of the citrus. Orange groves were hedge-rowed and skirted.  A few seedless tangerine groves were being netted to prevent cross pollination during the pending bloom.

    As field conditions permitted walnut and pistachio orchards were pruned. Where dry enough cleanup of trees toppled by high winds began. Almond bloom was progressing with the southern portion of the state nearing completion. Rain and wind caused some almond petal drop.

    Recent rains slowed some harvesting but broccoli, romaine, and red lettuce harvest continued in Imperial County.  In Fresno County, winter onion and garlic fields were being fertilized and cultivated.  In Tulare County, squash was being planted in hot tunnels.  New fields were being prepared for spring planting.  Strawberries continued to thrive.

    Non-irrigated pasture and rangeland continued to improve with warming temperatures promoting forb and grass growth. Range was reported to be in excellent to fair condition. Supplemental feeding of livestock continued to wane as range conditions improved. Bees were active in almond orchards. Sheep grazed stubble fields, idle cropland, and dormant, alfalfa.

  • USDA California Crop/Weather Report

    Sacramento, Calif., (February 7, 2017) – The week began with high pressure over the Great Basin. By mid-week an onshore surge of moisture associated with a Pacific northwestern system arrived. A brief break occurred on Saturday between systems before a second Pacific northwestern storm brought additional precipitation to the State on Sunday.

    Widespread rains and snow fell across the northern two thirds of the State last week, with Monday and Tuesday being dry statewide. On Saturday, rain was confined to an area centered between Sacramento and Redding with amounts reaching up to a quarter of an inch. On all other days, light to moderate rains fell across the State. Most places in the valley received one and half to two inches of rain, with around one inch in the southern valley. Coastal locations received one to two inches of rain, with the Los Angeles basin receiving between half and one inches. The deserts largely missed out on the rains. Additional snowfall in the mountains were just under two feet in most of the northern and central Sierras, with one foot being the norm in the southern Sierras. The northwestern coastal ranges received up to six inches of new snow. Temperatures were cool enough to result in overall growth of the snowpack except at low elevations and latitudes.

    Temperature highs were in the 30s to 50s in the mountains, 50s to 60s in the valley and along the coast, and 50s to 70s in the desert. The temperature lows were in the 0s to 30s in the mountains, 30s to 40s in the valley and along the coast, and 30s to 50s in the desert.

    Growers continued to wait for fields to dry out sufficiently to resume planting winter grains and other crops. The planted grains and field crops continued to mature at an excellent rate, reaping the benefit of the recent rain, and now sunshine. Black-eyed beans were exported.

    Orchards in the San Joaquin Valley began to dry out, allowing for some orchard pruning and new planting of trees where the ground had been previously prepared for planting. Pre-bloom sprays were applied to some stone fruit. Pruning, tying, berm sanitation, and brush shredding were starting up again as vineyards and orchards dried. In drier locations the removal of older orchards and vineyards continued in preparation for replanting with new varieties. The Navel orange harvest picked up with the clear weather. Satsuma tangerines continued to be harvested.

    As field conditions permitted, orchards continued to be pruned and brushed. Some late dormant sprays were applied. Almond buds were popping and swelling in the Southern San Joaquin Valley.

    Winter vegetables continued to mature. Harvest resumed in some areas when weather permitted. In Madera County, weed control was ongoing for tomatoes.  Application of herbicides to mature onions occurred. Carrot harvest was about 50 percent complete.

    Non-irrigated pasture and rangeland continued to green up in response to the much needed precipitation and warming temperatures. Range were reported to be in excellent to good condition. Sheep grazed idle fields and dormant alfalfa fields. Supplemental feeding of livestock continued but not to the extent of recent months. Where field conditions permitted, bee hives were staged in preparation for the pending bloom season.

  • USDA California Crop/Weather Report

    Sacramento, Calif., (February 1, 2017) – The stopping of the Pineapple Express coupled with a retreat of the persistent upper-level trough that has been present over the western region for the last couple of months produced a week of warmer and drier conditions.

    Temperature highs were in the 10s to 40s in the mountains, 40s to 50s in the valley, 40s to 60s along the northern coast and deserts, and 70s to 80s along the southern coast. The temperature lows were in the -10s to 20s in the mountains, 20s to 30s in the valley, 20s to 40s in the desert, and 30s along the northern coast and 40s along the southern coast.

    Widespread showers fell on most of the state on Monday, with the heaviest rains seen in the San Diego area, where over one inch fell. Most other areas received less than a quarter of an inch of rain. Snow fell in the mountains, with the greatest accumulations in the 4-8 inch range in the area just southwest of Tahoe and also in parts of the southern Sierras. Tuesday and Wednesday continued to bring limited showers in certain areas, particularly the northern mountains and southern coasts. Thursday through Sunday saw no measurable precipitation at any reliable sites. Snow packs in the mountains continue to be in very good shape, maintaining cover through the week and likely increasing by 4-6 inches in the area around Tahoe.

    Continued rains have benefited the growth of already planted grains and field crops, but the rain has hindered ground preparations for continued planting. Low spots in some fields were showing stress from repeated standing water. Farmers in some areas have been encouraged to report crop losses due to flooding.

    Standing water and muddy conditions continued to hinder fieldwork for much of the state. Winter field work continued when conditions permitted. Deciduous fruit orchards continued to be pruned and brush shredded. Removal of orchards and vineyards continued in preparation for replanting with new varieties. Rain continued to slow navel orange and Satsuma mandarin harvest. Fungicide applications to citrus were made as conditions allowed.

    Some almond and walnut orchards were impacted by falling trees due to strong winds and saturated ground. Nut orchards continued to be pruned and brush shredded as weather conditions permitted.

    In San Joaquin County, conditions were drying out, which helped with standing water in the fields.  In Monterey County, heavy rains were welcomed, though the saturated ground restricted field access.  Growers began planting cole crops, as well as lettuces and greens.  In San Mateo County, the fields were still very wet and unworkable.  In Fresno County, the onions and garlic have germinated.

    Non-irrigated pasture and rangeland continued to green up due to this winter’s rain. Range was reported to be in excellent to good condition. Standing water and flooding continued to impact some valley pasture and dairies. Sheep grazed idle fields and dormant alfalfa fields. Where field conditions permitted bees were staged in preparation for the bloom season. Bee keepers continued to feed their hives to compensate for the lack of blooming vegetation.