In hot summer, people want to buy safe vegetable, eat safe food. So, how farmers can grow pollution-free vegetables? According to experts, August is the period of high incidence of pests and diseases, pesticide use most frequently, vegetable with higher pesticide residues. Farmers at the time of deworming should establish a sense of science medication to ensure vegetable reach the safety interval period before listing.
Specific measures: prohibiting the use of highly toxic, high residue pesticides. Disable pesticides have: methamidophos, dicofol, dimethoate, carbofuran oxide, methyl 1605, monocrotophos, water amine parathion, phosphamidon and so on. Promote the use of low toxicity, low residual pesticides and more use ecological pesticides, such as azadirachtin, it is non-toxic to the human body, no adverse effects. More use high efficiency and low toxicity pesticides, such as, chlorfenapyr, indoxacarb, chlorfluazuron, spinosad, etc.
Spinosad has fast insecticidal speed, control young larvae of beet armyworm, diamondback moth larvae, thrips and so on. Spinosad without interacts resistance with various insecticides currently application. With 2.5% liquid suspensions 1000~1500 times, spraying to control 2~3 moth plutella xylostella, every per hectare spraying liquids 50~60 kilograms. Every per hectare use 2.5% suspension 50~100ml, in the evening, spray larvae of spodoptera exigua; use 2.5% suspension 33~50ml per hectare or 1000~1500 liquid, spray to control thrips (focus on spraying the delicate parts of thrips damage). Stop using spinosad products 1 day before vegetables harvest.
Using method are as following: chlorfenapyr pesticide control diamondback moth, pieris rapae, beet spodoptera, twill spodoptera, cuisine borer and so on. Best in low age larvae peak or insect mouth lower, each acres with 10% chlorfenapyr pesticide 30ml, insect age higher or insect mouth larger with 50ml, plus 50kg water to spray, each plant can only spray 2 times, especially in cruciferate vegetable, the security interval period is 15-20 days. Indoxacarb pesticides controlling pieris rapae in the 2~3 age, every per hectare use 15% indoxacarbsuspension 10ml, leaf vegetable, Eggplant and fruit vegetable's safety intervals period is 3 days. Chlorfluazuron pesticide control diamondback moth, Cabbage Moth, spodoptera litura, spodoptera exigua, per hectare use 5% EC 30~50ml add 50 kilograms water, spraying in hatch peak, safety intervals is 7 days.
In addition, it also can use sexual inducer to replace pesticide, it releases synthetic sex pheromone compounds by baits, luring male moths to traps, kills the male moth, damaging mating, achieve the control objective. It should be noted that sex pheromone is lure adult, trapping shall start at the low density; the trap location, height, air flow will affect the trapping; Caution to storage at lower temperature fridge when saved, stay away from high temperatures, baits should avoid exposure, thus reducing the volatile of sexual pheromone products; Sex pheromone with highly sensitive, install various pest baits should wash your hands to prevent pollution; regularly check the trap, timely clean dead insects, not dump the dead insects in the field.
Source:http://www.cospcn.com