Disease management in orchards

Effects of fungicidal compounds on phytophagous mites

Fungicides, herbicides and insecticides are all pesticides used in plant protection.

A fungicide is a specific type of pesticide that controls fungal disease by specifically inhibiting or killing the fungus causing the disease.
Pesticides with fungicidal activity may have a direct impact on phytoseiids, but they can also have an indirect effect reducing food availability for predatory mites.
In humid areas, where fungicides form a large proportion of the sprays applied to some crops, it is important to know their effect on mite populations (Table 1).
Several compounds that are fungicidal (e.g., sulphur, dithiocarbamates, binapacryl) are highly toxic to various eriophyoids. In general, they are not effective against spider mites.
DDT, carbaryl, mancozeb and other pesticides can, in some instances, stimulate population increases of spider mites*.
Methidathion and copper compounds can stimulate population increases of citrus rust mites# .

See this article, references and table in Tree Fruit June 2018

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