First, the hazards of rice planthoppers The main characteristics of rice planthoppers is a type of fulminant, covert, migratory and devastating rice pests. While the pests harm rice, they can also spread the virus and spread it along with the airstream to provide an environment for various bacterial diseases such as Sclerotinia sclerotiorum. Insects and nymphs of rice planthoppers can all harm rice, and they are generally concentrated on the base of rice stalks or panicles. They suck the sap of rice plants and suffer damage from booting and heading. They cannot head or affect the plumpness of rice, resulting in reduced yields; at the same time, rice The planthopper can also spread rice stripe disease, aggravate the occurrence of sheath blight, and secrete toxic substances, causing the rice plant poisoning to atrophy, the lower part of the rice stem becomes dark brown, the grain becomes brown oyster shell, resulting in lodging, withered and endangered Seriously caused 30% -70% reduction, or even no income.

Second, the control period and methods in the early stage of planthopper control and in the young stage of nymphs, the main selection of high-efficiency, low toxicity, environment-friendly, longer duration of the pesticide, such as pymetrozine, thione, 50% apiosis amine. In the case of serious field crops of rice planthoppers in the late stage of rice growth, it is necessary to use pytrazolone, leptin, isoprocarb, dichlorvos and other fast-acting control agents.

1. During the control period, SBPH was controlled in paddy fields and Honda. White-flyed flycatchers were mainly in early August, and brown planthoppers were mainly controlled in the middle and early August.

2. The specific pesticides used for the control of rice planthoppers are 1000 heads per hundred bunches. (1) a. Mu with 10% Dagong Chen 40-60 grams or 52.25% Gan Xi EC 50-60 grams, spray 30 kg of water. Or use 25% purofuran 50-60 grams, spray 30 kilograms of water (Bucillus kills larvae at the peak stage of the young nymph of the planthopper, so that the nymphs die before the molting). b. Mu with 10% imidacloprid wettable powder or 3% acetamiprid EC 20 ml, spraying 30 kg of water, effective for both adult and nymph of cornea. c. Drain the paddy fields first, then use 80% dichlorvos EC 200 ml soil mix 20 kg to apply fumigation. For a large number of adult plots, a mixture of buprofen and dichlorvos may be used. (2) Control and control of whitebacked planthoppers and brown planthoppers. The use of drugs can be controlled by 5% Ruijinte SC40-50 ml/mu or 5% Aiduobao 40-50 ml. (3) In the event of a large fly locust, available pesticides such as dichlorvos, omethoate, leaf glycosides, sedogenic carbendazim, mixed carbendazim, chlorpyrifos, acephate, pyrethroid, etc. all have good speed kills. The effect is combined with the long-term pesticides such as buprofezin and fipronil.

3. Prevention and control points 1. Nitrospiritin control is prohibited for imidacloprid pesticides; pests in rice fields are banned from pyrethroids and their compound preparations; 2. the amount of water required for application is sufficient, and the amount of liquid used for routine spray is not less than 50 kg per mu. The motorized mist sprayer shall have a liquid volume of not less than 25 kg per mu, and the field shall maintain the water layer during application. 3. When spraying, it is necessary to adopt the "encirclement and suppression" tactics, that is, to fight from the four weeks to the middle; the key part of spraying is the middle and lower part of rice, and the middle and lower parts of rice should be thoroughly penetrated when spraying. For serious landslides, they should be controlled every 5-7 days. In order to improve the control effect, silicone additives can also be added at the time of application, such as good wetness, excellent efficacy and so on.

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