Peach Twig Borers: A Guide for Young Fruit Tree Growers
What are Peach Twig Borers?
Peach twig borers are tiny worm-like creatures that can wreak havoc on your peach, nectarine, and plum trees. These pests are the larvae of plain-looking gray moths.
Unlike peach tree borers, which attack the trunk of the tree, peach twig borers target new growth, causing it to wilt and die back. This can stunt the growth of young trees and reduce fruit production.
Peach Twig Borer Life Cycle
Peach twig borers have multiple generations each year, with two to five being common. The larvae spend the winter under the bark of the tree, emerging in late winter to feed on new shoots.
As they mature, the larvae tunnel into the stem end of the fruit, causing it to become disfigured and inedible. The larvae pupate in crevices in the bark, emerging as adult moths that lay eggs on the undersides of leaves.
Methods of Peach Twig Borer Control
Managing peach twig borers requires careful timing and a combination of methods.
Timing is Key
The timing of your control measures is crucial. Here are some general guidelines:
- Before buds swell: Apply horticultural oils to suffocate overwintering larvae.
- Around bloom time: Spray Bacillus thuringiensis (Bt), a biological insecticide that targets caterpillars. Repeat applications two to three times per generation during warm weather.
- After petals fall: Use spinosad, another insecticide that is effective against peach twig borers.
Additional Control Measures
- Remove infested twigs: Prune and destroy any twigs that show signs of borer damage.
- Keep trees healthy: Healthy trees are more resistant to pests. Water and fertilize your trees regularly.
- Monitor for pests: Regularly inspect your trees for signs of peach twig borers, such as wilting shoots or damaged fruit.
Damage Caused by Peach Twig Borers
Peach twig borers can cause significant damage to young trees, especially if left unchecked. They can kill new growth, stunt tree development, and ruin fruit crops.
The good news is that trees can usually recover once the infestation is controlled. However, young trees may experience a setback in growth.
Identifying Peach Twig Borers
Larvae:
- Small, worm-like creatures
- Whitish or cream-colored
- Found in new shoots or fruit
Adults:
- Plain gray moths
- About 1/2 inch long
- Lay eggs on the undersides of leaves
Conclusion
Peach twig borers are a common pest of stone fruit trees, but they can be managed with careful attention to timing and control measures. By following the tips outlined in this guide, you can protect your trees and ensure a bountiful harvest.
