Do not use a single variety of pesticides for a long time in greenhouse vegetables. The varieties used for rotation should use pesticides with different mechanisms of action. For example, organophosphorus preparations, pyrethroid preparations, carbamate preparations, organic nitrogen preparations, biological preparations, insect growth regulators, herbicides, and the like of insecticides have different mechanisms of action. The same type of formulation of pesticides can change with each other, but it must be clear whether there is cross-resistance between them, whether an injury of vegetables. For example: Diaeretiella resistant to dimethoate, dichlorvos can not be used, because Diaeretiella also resistant to DDVP, but you can use imidacloprid class.
On fungicides, the general systemic fungicides easy to produce drug resistance, such as benzimidazoles fungicide (carbendazim, thiophanate and the like), antibiotics, fungicides, etc. in the vegetables, but are unlikely to cause an anti-contact fungicides Medicinal properties, such as Daisen, inorganic sulfur preparations, copper preparations, are a good rotation combination.
Second, mixed medication
The combination of two agents with different action mechanisms can alleviate the resistance of greenhouse vegetables. For example, mixed with toxic mycelium and mancozeb, organic phosphorus agent and chrysanthemum, acaricide mixed with other insecticides, insecticide and fungicide mixed. Once the vegetable pests develop resistance, the effect of switching to the compounding agent is obvious. The mixed agents must be applied in a small area before being applied in a large area. When mixing, it should be slightly shaken or stirred. It should be used with the product and should not be stored for a long time. Pesticides with high prices during compounding can be reasonably mixed with low-priced pesticides. Mixed pesticides should not be applied to vegetables for a long time, otherwise they will also cause resistance to vegetable pests and diseases.
Third, the intermittent use or deactivation of pesticides
A pesticide has caused resistance to vegetable pests and diseases, and can be stopped for a certain period of time, and the resistance of vegetable pests and diseases is reduced or disappeared.
Fourth, take the correct application of pesticide technology
For the greenhouse vegetable pests, must be proper administration technique, the drug is deposited on the distribution of vegetables. After spraying only on proper pesticide use, not use high concentrations of formulated drug, pesticide (wettable powders, flowables, emulsifiable concentrate formulation) must be diluted with water or an organic solvent.
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