| The time has come for dormant spraying. There are several types of sprays available, each with advantages and disadvantages as compared to the others.
LIME SULFUR (calcium polysulfide) and SPRAY OIL are combined and sprayed together; the lime sulfur kills fungus over wintering on the surface of the plant, while the spray oil acts as a spreader-sticker. The spray oil also acts as an insecticide by smothering insects and their eggs. Lime sulfur should not be used on apricots.
COPPER SPRAYS lack the ability to control insects but are more effective than lime sulfur on certain diseases. Lilly Miller MICROCOP is a powder sprayed in conjunction with Lilly Miller STA-STUCK “M”. Powdered sprays cannot be used in hose-end sprayers. If that is your preference you should use Monterey LIQUICOP. Lacking the Sta-Stuk, the Liquicop may not be as effective in rainy weather, but it is easier to apply. Spraying during the dormant season allows the gardener to rid the plant of fungus and control certain diseases such as peach leaf curl that cannot be eradicated once the leaves open in the spring. Late winter/early spring applications in cool, rainy weather just after dormancy ends help control scab on apples, fire blight on pears, anthracnose on dogwoods and damping off of vegetable seedlings. Later in the season copper sprays will protect tomatoes against early and late blight and prevent leaf spots on flowers and vegetables. |