Frequently Asked Questions
Q. 6/02 Why are the leaves of my peach tree crinkled and red?
Q. 7/1 This apple tree obviously has a problem. Leaves died back quickly and blackening of the bark around area of missing bark. Do you have any thoughts on this one?
A. This looks like fireblight. Carefully remove and dispose of infected branches as soon as they appear. Cut at least 6-12″ below signs of infection. Prune out any remaining cankered branches during dormant season. Avoid high rates of nitrogen. Where severe, apply fungicide containing copper at bloom.
Q. 8/3 The leaves of my apple tree get brown spots, turn yellow, then fall off the tree. Is it dying?
A. This leaf disease is apple scab. Reduce chance of the disease reoccurring next year by removing fallen leaves and apples. Good pruning will reduce number of sprays needed. Apply Captan (registration in New York expires 3/09) from tight cluster to until 2 -3 weeks after petal fall. Do not apply captan within 10 days of a dormant oil spray.
Q. 8/29 My peaches have dark spots on them. Are they safe to eat?
A. Peach scab appears as green to black spots near the stem end of the peach. Regular pruning improves air movement, reduces length of wet periods, reducing chance of disease. Fungicide sprays, applied at 10- to 14-day intervals, should be made beginning at petal fall and continuing until 40 days before harvest. The peaches are safe to eat.
Using Pesticides Safely
Indiscriminate use of pesticides introduces unneeded chemicals into the environment, puts yourself at risk of contamination, possibly kills beneficial insects and could lead to pesticide resistance in pest insects. Before choosing an insecticide, ask yourself how much damage you can withstand. If the damage to the plant is only aesthetic, your first option is always to do nothing. To choose the appropriate insecticide, look for the name of the pest and the host plant on the label. Always read the label and follow the directions for application methods.
This publication may contain pesticide recommendations that are subject to change at any time. These recommendations are provided only as a guide. It is always the pesticide applicator’s responsibility, by law, to read and follow all current label directions for the specific pesticide being used. Due to constantly changing labels and product registrations, some of the suggestions given in this writing may no longer be legal by the time you read them. If any information in these recommendations disagrees with the label, the recommendation must be disregarded. No endorsement is intended for products mentioned, nor is criticism meant for products not mentioned. The author and Cornell Cooperative Extension assume no liability resulting form the use of these guidelines.