Correct selection and use of pesticides in vegetable production

There are many factors restricting the production of pollution-free vegetables, and the correct selection and use of pesticides in the prevention and control of vegetable pests and diseases has become a key issue in the development of pollution-free vegetables.

First, pesticide selection

1. Select microbial pesticides or biochemical preparations, microbial pesticides (pesticide antibiotics), which can prevent and treat diseases and diseases, and pollute the environment and poison humans and animals. And for natural enemies, pests do not develop resistance. Such as hd-1 nymphs No. 6, spring leimycin, bt emulsion, agricultural anti-120.

2. Soil pesticides, using non-pharmaceutical substances to control the occurrence of pests and diseases. Such as 800 ~ 1000 times liquid urine washing agent (1 part urea, 0.2 parts washing powder, 100 parts water mixed), lime tobacco water (lime soaked in tobacco a day and night filtered), the control effect on aphids up to 85 %the above.

3. Select a specific insect growth regulator. This kind of chemical pesticide, the insecticidal mechanism is to inhibit the growth and development of insects, so that it can not be peeled and propagated, its insecticidal property is very high, and its toxicity to humans and animals is extremely low.

Second, the use of pesticides

1. Use a suitable pesticide type or dosage form. Such as è™± è™± çµ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹ å¯¹Early blight, late blight and other high efficiency, but can not prevent powdery mildew. In the prevention and control of pests and diseases in protected areas, in order to reduce the humidity, the aerosol or dust agent can be flexibly used.

2, strictly control the best prevention period, to achieve timely medication. For example, before planting or transplanting vegetables, measures such as seedling room, greenhouse application, soil treatment and pesticide dressing should be taken; when aphids and mites occur, white powder meal is used at low density, under normal circumstances. It should be used in the afternoon and used before watering.

3. Strictly control the amount of drug used and the concentration of preparation to prevent phytotoxicity and damage to natural enemies. For example, to prevent powdery mildew, only 3 to 5 grams per acre (active ingredient) is needed for disease-resistant varieties or lightly occurring, and 7 to 10 grams per acre for susceptible varieties.

4. There should be a safe interval between the last use of pesticides and vegetable harvesting to prevent pesticide residues in vegetable products. It is usually 6-8 days in summer, 8-11 days in spring and autumn, and 15 days in winter, and vegetables should be rinsed thoroughly before consumption.

Author: Lee school group
Source: Shandong Science and Technology News

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November 19, 2018