pest Archives - West Coast Nut



Update on Sterile Insect Program for Control of Navel Orangeworm

Houston Wilson, Asst. Coop. Extension Specialist, Kearney Ag. Center, Dept. Entomology, UC Riverside Chuck Burks, Research Entomologist, USDA-ARS, San Joaquin Valley Agricultural Sciences Center   Sterile Insect Technique Sterile insect technique (SIT) makes use of large numbers of sterile insects which are released into wild populations as part of an area-wide integrated pest management (IPM) control strategy. Insects are typically mass-reared in a controlled environment and then ionizing radiation (e.g. x-rays, gamma rays) is used to induce genetic mutations that lead to sterility. The basic idea is that introduction of sterilized individuals into the wild population will limit the successful...

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Mating Disruption: A Crucial Tool for Nut Growers

By Kathy Coatney   Mating disruption for navel orangeworm (NOW) has been widely tested throughout California with numerous research studies, and peer-reviewed research has demonstrated its efficacy. Mating disruption is a very simple process. Females emit pheromones, males use those pheromones to find the female. If an orchard is flooded with artificially produced pheromone the entire orchard smells like a female and the males struggle to find the real females. If they don’t find each other, they don’t mate, and if they don’t mate there are no eggs, no larvae, and less overall nut damage.     Mating Disruption in...

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pecan aphids

Insecticide Efficacy for Pecan Aphids

By: Cecilia Parsons, Associate Editor Aphid infestation and damage to pecans has become worse in the past five to six years. Mild Winters Larry Blackwell, New Mexico State University researcher and program coordinator College of Agricultural, Consumer and Environmental Sciences, said that pecan producers in New Mexico are dealing with higher aphid numbers in their pecan orchards due to lack of freezing winter temperatures in recent years. “We have had really mild winters and thus no kill off,” said Blackwell. The high numbers of aphids in pecans is the result of the climate, and not just due to population build up,...

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Approaches to Spider Mite Management in Almonds

By: Emily J. Symmes, IPM Advisor UCCE and Statewide IPM Program Spider mites are considered indirect pests in almonds, in the sense that they do not feed directly on the harvested product. Rather, they cause injury to plants by sucking cell contents from foliage. Signs of feeding injury include leaf stippling, yellowing, and dropped leaves. High populations of mites can also be recognized by webbing on leaves and tree terminals (Image 1). Significant spider mite injury can become economic crop damage in almonds in subsequent seasons in the form of reduced vegetative tree growth and crop reduction. In addition, excessive leaf...

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Walnut & Almond Pest Management: Preparing for a Successful New Year

By: Emily J. Symmes, IPM Advisor UCCE and Statewide IPM Program With the wild ride of the 2017 growing season now behind us, January is a good time for orchardists to take stock of the key issues of the previous year and begin outlining their production and pest management activities for the upcoming season. During the dormant period, one of the most critical activities that can be done is to sit down with your orchard manager, pest/crop adviser, and your record books to review your pest management history and devise a plan-of-attack for the coming season. Heading into the season armed...

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