Pests curative control

There are limited options for curative control allowed under organic agriculture guidelines, which vary from country to country. Curatives are inputs to the crop production system that are applied after a pest or pathogen has established in the crop, and threatens to reduce yields if action is not taken. Table 4.1 provides a representative list of botanically derived pesticides, microbial agents and other naturally available materials typically approved under organic standards. These materials vary in their toxicity levels and non-target effects. 

Sulfur has long been known for its properties as a pesticide and a curative agent. Homer spoke of the pest-averting sulfur as far back as 800—1000 BC, Hippocrates (400 Bc) considered sulfur sa an antidote against plague, and Dioscorides (100 ad) used sulfur ointment in dermatology (244). In 1803, the use of a lime—sulfur protective treatment for fmit trees was reported, and in 1850 sulfur dust was used to protect foHage (245). In 1891 sulfur dust was used on soil to control onion smut (246). 

Prevention and Control Plant resistant cultivars. Remove surrounding weeds, such as thistles and plantain, that provide disease overwintering sites. Leafhoppers carry the curly top virus, so keep these pests away by protecting plants with floating row cover. See page 302 for more leafhopper controls. Remove and destroy affected plants. 

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