Environmental protection methods for vegetable pests

　　 1. It is a kind of " washing urine mixture " prepared by mixing fertilizer with urea, washing powder and water in a ratio of 4 : 1 : 400 . It has good effects on various pests such as aphids, cabbage caterpillars and red spiders. Control effect; in the spawning period of cabbage caterpillar, spray with 1% ~ 3% lime water or 1% ~ 3% calcium perphosphate leaching solution, can avoid more than 52% within one week , the effect on the fifth day can reach 84% .

 

　　 2. Take 100 grams of cabbage caterpillars per acre of dead insects , mash and rot, 250 ml of water , add 50 grams of washing powder , and then 50 kg of water , and prepare 0.2% of the vegetable body fluid, spray to control cabbage caterpillar The effect can reach more than 90% .

 

　　 3. The fungus is treated with corn flour as the main medium for the cultivation and breeding of the shellfish to control the greenhouse whitefly, and the parasitic rate of the whitefly nymph is more than 80% .

 

　　 4. trapping stack cricket like habitat grass weeds in a thin layer below the thickness of 10 to 20 centimeters small hay line by 5 m, 3 m pile uniformly placed in the field, exposing the next concentration killing grass; if Put some poison baits under the haystack or use a wooden stick with a diameter of 3 to 5 cm to form a cave. The effect is better. This method is not convenient for large-scale promotion and is suitable for application in vegetable fields.

 

　　 5. Yellow plate traps aphids, whitefly, etc. have strong tropism for yellow, can set yellow plate to trap adults. The method is: the cut cardboard or fibreboard strip 1 m × 0.2 m, painted yellow orange peel, then coated with a viscous oil (a No. 10 oil plus a little butter and mix thoroughly), 32 to 34 mu, Place between rows so that the bottom of the yellow plate is level or slightly higher than the top of the plant. When the plate surface Nianman aphids, whiteflies, etc., the need for timely recoating viscous oil, generally 7 to 10 days once re-painted.

 

6. Sexual hormonal seduce At present, the application of sex pheromones is roughly in three forms: the use of artificially synthesized sex hormones ( called " sex attractants ") , the use of crude extracts of pheromones, and the direct use of unmarried Live female. The use of female moths to trap and kill is easy to operate, low in cost, easy to promote, and the application effect is obvious when the amount of insects is small. Approach is: 50 to 60 mesh with a 10 cm long made of insect net, 3 cm diameter circular cages, each cage 1 ~ 2 is not put in the mating female moths (available in the field to collect the female pupae on cage where stand after emergence), the cage hanging in the basin, filled with water and add a little kerosene within the basin, put on after dusk Tanaka, every night can trap and kill a lot of male moths.

 

Source: China Agricultural Information Network