Late spraying nectarine trees

Asked April 16, 2019, 2:43 PM EDT

What can I spray on our nectarine trees now that they are blooming. What is the best over the counter spray and sticker to use. HELP.

Douglas County Washington

1 Response

No it is not too late to apply some sprays to your fruit trees. Depending on your trees it is probably too late to do the ones that are supposed to happen BEFORE they bloom like the late dormant spray. There are sprays that may be needed to keep your trees healthy after the bloom is over. I am providing a link to an Oregon State University Publication “Managing Diseases and Insects in Home Orchards” EC 631

This publication lays out the type of sprays and chemicals that can be used to control pests in your trees and WHEN they should be applied. It also discusses non chemical management and cultural practices to reduce disease and insect pests.

Spraying nectarine trees with the right insecticides and at the right time is essential to growing a good crop. Here are our recommendations for nectarine spraying:

The first spray of the season is in early spring, before the buds begin to swell. There are two fruit tree sprays for nectarines that should be used when temperatures are between 45 and 55 degrees. Use a copper-based fungicide to prevent powdery mildew, bacterial blight, and leaf curl. Use superior petroleum horticultural oils to kill overwintering scales, mites and aphids.

When the buds swell and show color, but before they open, it’s time to spray for caterpillars and twig borers with spinosad. At the same time, you should spray for aphids, scale, stink bugs, lygus bugs, and Coryneum blight. Insecticidal soap is a good insecticide that manages all of these pests.

The next growth stage is bloom time. Avoid spraying insecticides to preserve and protect honeybees. When the petals drop away leaving a small fruit behind, it’s time to think about aphids and stinkbugs again. Spray as you did at bud swell. If you have feeding caterpillars, spray them with Bacillus thuringiensis or spinosid.

In the warm days of summer, you may have problems with peach tree borer. Esfenvalerate is the least toxic option for this pest. For spotted winged drosophila, spray with spinosid.

Use Insecticides Safely

Even though these are relatively safe insecticides, you should take precautions when using them. Spray on calm days to prevent the sprays from drifting into the garden where you are trying to encourage beneficial insects. Keep children and pets indoors while you spray, and wear the protective clothing recommended on the product label. Store insecticides in the original container and out of the reach of children.

Hope this helps!