Tree and Shrub Care
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*Due to variation in the concentration of pesticides in different products, refer to the label for the specific rate per 1 gallon spray solution.
WP = wettable powder
EC = emulsifiable concentrate
DF = dry flowable
Use sulfur fungicides throughout the spray program. Decrease application interval to shortest interval allowed. Shortened intervals are important during the late bloom, shuck split and first cover period and again during the preharvest period. These are periods when fruit diseases are most damaging.
Copper sulfate is considered an organic fungicide and some formulations are approved for use on pecans to control pecan scab and other foliage diseases. Copper sulfate is highly toxic to fruit trees such as peaches, plums, apricots and nectarines, and to some ornamental plants. Be careful when using this product around sensitive plants if there is a possibility of drift.
Most plant diseases require that the leaf, fruit or nut remain wet for a certain length of time for infection to occur. The following precautions should be taken to reduce the length of time the plant is wet following dew or rainfall: (1) prune trees to allow sunlight to penetrate the leaf canopy; (2) space trees to allow for air circulation; (3) plant trees in an area that will receive early morning sun and where air circulation will not be blocked by buildings or other plants; and (4) avoid wetting the tree during irrigation.
Select varieties that have natural resistance to the major diseases of your area. Resistance does not mean immunity to infections, but fungicide applications are usually more effective on plants with some resistance.
Do not spray any application after pecan shucks splits or during harvest. After harvest, spray schedule may be resumed to control walnut caterpillar, fall webworm and fall foliage diseases. It is important to try to keep your trees disease- and insect-free in order to keep the foliage on the tree as long as possible. Remember, between harvest and normal leaf drop and dormancy, the foliage is manufacturing food for next year’s nut production.