Key Management Points for Greenhouse Potatoes During the Tuber Formation Stage

1. Disease control. Spray in the field at the early stage of disease onset, using 75% thiophanate-methyl at 600-800 times dilution, or 40% carbendazim at 400-600 times dilution, or 600 times dilution of anthracnose fumei, to control anthracnose, powdery mildew, late blight, etc.; use 72% agricultural streptomycin at 20 grams per mu (667 sq m), or 25% qingkuling wettable powder, to control bacterial scab: use 72% puleike aqueous solution, or 30% eduling aqueous solution at 800 times dilution, or 70% mancozeb wettable powder at 500 times dilution, to control fusarium wilt and gray mold; use 20% virus A or 1.5% zhibingling wettable powder at 500 times dilution to control viral diseases; use 72% kelü wettable powder at 600-800 times dilution, or 77% keshadé wettable powder at 500 times dilution to control late blight, cottony leak, cottony soft rot, etc.; in protected cultivation, 5% shuangke dust, or 5% shuangmeiwei dust, or 5% chlorothalonil dust at 1 kilogram per mu (667 sq m) can be dusted to control multiple diseases.

2. Pest control: (1) Spraying at the young larval stage: use 0.9% abamectin at 3000 times dilution to control tea yellow mite; use 10% dagongchen wettable powder at 1000 times dilution to control aphids: use 2.5% kungfu emulsifiable concentrate, or 10% imidacloprid emulsifiable concentrate, or 4.5% beta-cypermethrin emulsifiable concentrate at 1500 times dilution to control aphids, cotton bollworm, tobacco budworm, beet armyworm, and American leafminer. Spray once every 5-7 days, for 3 consecutive sprays. (2) Physical control: in protected cultivation, yellow boards or yellow tubes can be set up to trap and kill whiteflies, tobacco whiteflies, aphids, American leafminer and other pests attracted to yellow, or silver-gray plastic film can be used to repel aphids. (3) Biological control: actively protect and utilize natural enemies; when adult whiteflies are found, Encarsia formosa can be released; biological agents, using 1.8% chongmanke soluble concentrate, or 2% junduke (ningnanmycin), or 72% agricultural streptomycin sulfate soluble powder, or 5% kasiike emulsifiable concentrate and other biological preparations to control pests and diseases, etc.

Vigorously apply protected cultivation techniques to improve the commercial value of vegetables. Plastic film mulching technology, the use of small arched sheds and large plastic tunnels, and shading net and insect-proof net covering cultivation have been mastered and applied by a large number of farmers. In cities with good conditions, greenhouses with controllable temperature, humidity, and air can also be used, breaking the traditional habit of growing vegetables according to the seasons and climate, and their commercial value is greatly improved. Protected cultivation can also reduce and prevent the occurrence of pests and diseases through artificial control of climate and soil (substrate) conditions, making the production of pollution-free vegetables a reality. If pests are found damaging the bell peppers grown in the greenhouse, some natural enemies can be artificially released to control the occurrence of pests, so as to reduce the number of insecticide sprays and make vegetable products safer.