Scab: apple potato

Escape Shorter crop growth period and/or early ripening to be able to avoid the critical infestation period, or to have enough yield before the infestation becomes too severe (potato/late blight onion/downy mildew carrot/carrot fly) One or more monofactorial and multifactorial, durable resistance traits against pest and disease affecting yield and/or quality (scab/apple, late blight/potato, lettuce/downy mildew, yellow and brown leaf rust/wheat) weed competition by an allelochemical ability... 

How do you choose which control methods to use against a particular pest, such as Colorado potato beetles on potatoes or scab on apples A good place to start is the Problem-Solving Plant Guide beginning on page 11. The Potato entry will suggest some control methods for the beetle, the Apple entry describes ways to prevent or lessen scab problems. You can then refer to the descriptions of various products and methods that follow for information on how to make or use specific controls. 

Protection Offered Sulfur can be purchased alone or mixed with other insecticides and inorganic fungicides to control a wide variety of garden pests. Use sulfur as an insecticide to control insects and mites on fruit trees and citrus. You can also use sulfur as a protectant fungicide. It is effective against apple scab, brown rot of stone fruits, powdery mildews, rose black spot, rusts, and other plant diseases on many crops, including grapes, potatoes strawberries, and tomatoes. 

Of the derivatives, 5-carboxymethyl-3-methyl-tetrahydro-l,3,5-thiadiazine-2-thione (thiadiazinethion, 17), its sodium salt, and 3,3 -ethylene-bistetrahydro-4,6-dimethyl-2H-l,3,5-thiadiazine-2-thione (milneb, 18) have been used in agriculture, the latter being effective also against apple scab, tobacco peronospora and potato blight. 

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