Key points of disinfection in flower greenhouse

The greenhouse must be disinfected before use. The drugs used for disinfection should vary from shed to shed and to the type of diseases and insect pests. The following four aspects should be grasped in the procedure and content of disinfection:

1. Space disinfection: it should be carried out 7 ~ 10 days before sowing or planting. Mix 4 grams of sulfur and 8 grams of sawdust per cubic meter and burn them in a container. The time should be around 7 p.m., and the fumigation should be sealed for 24 hours. It can also be mixed with 25% chlorothalonil and 8 grams of sawdust per cubic meter and ignited for fumigation and disinfection.

Second, scaffolding, equipment, tools and other disinfection: wash or spray with 1 ∶ 50 ∶ of formalin solution.

Third, soil disinfection: pesticides should be selected according to the types of diseases and pests in the greenhouse soil, 10 ~ 15 days before planting. In the greenhouse where Fusarium wilt occurs seriously, 100-200 times formalin can be sprayed on the furrow or ground, and then covered with film for 5 days. After half a month, all the chemicals have volatilized, and then they can be sown and planted.

Other diseases can be sprayed with 1000 times of carbendazim, 50% topiramine or 70% dimethazone, or made into poisonous soil and turned into the soil. In the greenhouse with underground pests, a certain amount of pesticides can be added to the soil treatment.

Fourth, ditch (hole) disinfection: in a plot with serious wilt, if the soil is not disinfected or the disinfection quality is not good before planting, 1.25 kg of 50% topiramate per mu or 0.75 kg of 50% carbendazim per mu can be used in the planting ditch (hole). Or about 70% pentachloronitrobenzene 1 kg. The above chemicals should be mixed evenly according to 1 part of powder and 100 parts of fine dry soil, and then spread in the planting ditch (hole).