IN YOUR ORCHARD
Weed monitoring is another important task in the late fall and into winter. A careful weed survey after the first winter rains is the first step in effective weed management. Different herbicides work differently on certain weeds. You and/or your PCA need to know what’s out there to match up the proper herbicide and/or practices for best control. See details and examples of seedling weeds at: ipm.ucanr.edu/PMG/ C003/m003pcweeds02.html. Once target weeds have been identified, consider timing and materials for preemergent control for the coming season. Post emergent sprays can be used with preemergents as well as applied next year once rains have passed. Preemergent sprays should be applied to clean, bare soil. Herbicide(s) can attach to the leaf litter and not end up on the soil, reducing weed control. Talk with your PCA about preemergent materials/programs in young orchards. Water, nutrients, and sunlight make for “great”
weed growing, and repeated post emergent “burndown” applications can be expensive (materials and time). How and where herbicides are applied can make a difference in orchard health going into the new year. To make sure the labeled rate of herbicide is applied, remind operators to shut off the booms before slowing down at the end of the row and not until operating speed is reached when starting to spray. Shutting off herbicide spray at the end of the row avoids excess application that may harm trees and leaves of good infiltration veg strip at the end of each row, helping “bank” rainwater. Once leaf drop starts (November), spur samples should be taken to look for scale and scab. If control of either of these damaging pests is needed, a pre-bloom (dormant or delayed dormant) spray can deliver excellent control. Details
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