jan-feb-2020

IN YOUR ORCHARD of Plant Pathology. Bloom weather dictates the number of sprays. If dry weather is forecast for bloom, apply a single spray at 30–40 percent bloom, making sure that at least one locally systemic fungicide (FRAC 3, 9, and/or 11) is used. The Fungicide Resistance Action Committee (FRAC) groups different fungicide chemistries by mode of action on fungal pathogens. If rain is in the forecast, two applications — one at “pink bud” and another at full bloom are recommended for the best disease control. If warm, wet weather is in the forecast, use at least one fungicide effective on anthracnose should be included in both sprays. If the forecast is for wet and cool to cold, anthracnose should not be a concern, but jacket rot becomes a major concern for the full bloom spray. Note: FRAC 3 fungicides (Tilt, Indar, Quash, Tebucon, etc.) are effective on jacket rot and should not be the only fungicide used in wet, cool weather. For materials, timings and disease issues, check pages 31–32 in the Fungicides, Bactericides and Biologicals for Deciduous Tree Fruit, Nut, Strawberry and Vine Crops from the UC IPM. Visit ipm.ucanr. edu/agriculture and look at the bottom of the page under “More Information” for the download link. Bacterial blast has caused significant crop loss in the last several years in some orchards. Cold and wet weather from bud break through bloom is believed to be the most important factor predisposing flowers to bacterial blast. In particular, frost is linked to damage by this bacterial pest, which is commonly most severe low in trees and/or in lower areas of the orchard where coldest temperatures occur. Frost protection helps reduce blast FOR MORE INFO, PLEASE VISIT E X AC T COR P . COM OR CALL 209.544.8600 FOR EVERY PHASE OF NUT PRODUCT ION. . . SWEEPERS CALL US TO SCHEDULE YOUR HARVEST DEMOS CONDITIONERS CARTS R.O.P.S. Certified Eligible for the LOW-DUST Nut Harvester Replacement Program by the San Joaquin Valley Air Pollution Control District SELF-PROPELLED LOW-DUST CONDITIONERS E-CABS HARVESTERS SPRAYERS 4 2 A L M O N D F A C T S