The main diseases and pests of major pests and diseases at the seedling stage are damping-off disease, damping-off, early blight, and locusts; the main pests in the field are gray mold, late blight, leaf mold, early blight, bacterial wilt, virus disease, locusts, and latent diseases. Leaf flies, tea astragalus, whitefly, whitefly, cotton bollworm. The principle of prevention and control of pests and diseases shall be "prevention-based, comprehensive prevention and control", and adhere to the principle of harmless control based on "agricultural control, physical control, biological control, and chemical control shall be supplemented". Control methods: (1) Agricultural control: Including selection of disease-resistant varieties, creation of suitable reproductive environment conditions, implementation of crop rotation, scientific fertilization, and adoption of facilities protection measures. (2) Physical control: Yellow plates are used to kill aphids in large facilities. A yellow sticky board or yellow slats (size 25 cm 40 cm) is hung in the field, and a layer of engine oil is applied on the field, 30-40 pieces per mu. Small and medium sheds cover silver-gray mulch to repel aphids. (3) Biological control: Protect natural enemies and use biological agents for prevention and control. (4) Chemical control: damping-off and blight can be controlled by agents such as oxazin + mancozeb or propamocarb. Gray mold may be treated with etomicarb powder or procymidone. Early blight can be controlled by chlorothalonil dust agent or chlorothalonil smoke agent. It can also be controlled by mancozeb, chlorothalonil, metalaxyl manganese zinc and other agents. Late blight is preferably controlled by chlorothalonil dust agents and chlorothalonil smoke agents. It can also be controlled by agents such as phosphonium manganese zinc and propofol. Leaf mildew is preferentially controlled by kasugamycin + copper hydroxide dust, followed by Wuyimycin and Bordeaux mixture. Viral diseases can be controlled by agents such as morpholinium copper, and 83 antagonism agents. Aphids and whiteflies can be controlled by deltamethrin, imidacloprid, bifenthrin, veratridine, and other agents. Leaf miners can be controlled by avermectin, chlorpyrifos and other agents. The cotton bollworm can be used for the control of 3rd instar larvae, such as kungfu emulsifiable concentrate, cypermethrin emulsifiable concentrate, and bt preparation. When spraying, the dosage should be selected correctly according to the instructions for use of various types of pesticides.
Dental Handpiece
dental handpiece,dental handpiece high speed,handpiece dental,dental high speed handpiece,dental laboratory handpiece
Foshan Ja Suo Medical Device Co., LTD , https://www.fjoralinstrument.com