Pest | West Coast Nut



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Postharvest is a Good Time to Knock Back Vertebrate Pests in Nut Orchards

Harvesting nut crops followed by good orchard sanitation will deprive rodents of a preferred food source and drive them to poison baits far more easily in the fall, said Roger Baldwin, UC Davis wildlife specialist.   Ground Squirrels California ground squirrels are the primary vertebrate pest in many tree nut orchards, and fall presents a good opportunity for population control. With their primary food sources, nuts and vegetation, removed, squirrels are more likely to eat toxic baits. Multiple-dose anticoagulants can be applied in bait stations or spot treatments near burrows or broadcast where squirrel activity is present. The UC Pest...

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Soilborne Pests in Tree Nut Crops

Preserving tree health in the face of soilborne diseases and pests requires both careful management and choosing appropriate rootstock genetics for a given orchard site. In a West Coast Nut MyAgLife webinar on soilborne pests and diseases in nut crops, several experts in soilborne diseases and rootstock development shared their knowledge and experience on a number of common soilborne pathogens in walnuts and almonds, as well as breeding efforts to find solutions through resistant rootstock.   Diseases in Almonds Mohammad Yaghmour, orchard systems advisor in Kern County, said there has been a resurgence in recent years in Phytophthora, one of...

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Biological Pesticides in Nut Crops

Some of the biological products used in conventionally or organically produced nut crops include those based on bacteria (abamectin, Bacillus amyloliquefaciens, Bacillus mycoides, Bacillus thuringiensis (Bt,) Burkholderia rinojensis, Chromobacterium subtsugae and spinosad,) fungi (Isaria fumosorosea, Paecilomyces lilacinus,) virus (Cydia pomonella granulovirus) and botanicals (azadirachtin, neem oil, pyrethrins, and some essential oils.)  Except for B. amyloliquefaciens and B. mycoides for disease control and P. lilacinus for nematode control, the rest of the products are used for controlling insect and mite pests. While bacteria and the virus are primarily used against lepidopterous pests, others are used for insect and/or mite pests. Research...

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Creating Habitat for Beneficials to Control Aphids in Pecans

This article discusses planting and managing a cover crop mix in pecan orchards to attract beneficials, which provide some control of two species of pecan aphids. Controlling aphids in pecans with chemicals generally requires two to three spray applications over the season. To date, the grower has saved 1-2 sprays, and learned that alternate row mowing of the cover crop can extend the flowering and, therefore, the availability of nectar and pollen for supporting a wide variety of beneficial insects which suppress aphid populations. California Wildlife Conservation Board has funded a collaboration between the Environmental Defense Fund (EDF) and the...

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Some Basic Truths About NOW in Almonds

Successful control of navel orangeworm (NOW) depends on understanding the following truths:  The local population is always greater than you think it is.  Insecticide coverage is always worse than the applicator thinks it is.  Spraying will always take longer than you think that it should.  Little mistakes can have big consequences. Navel orangeworm management is currently based on a four-component “system”. Its elements are: 1. Sanitation 2. Mating Disruption 3. Insecticide Sprays and 4. Timely Harvest. Three of these elements have been in place for decades,...

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