Control techniques of stem rot of flower seedlings

Stem rot of flower seedlings is a kind of disease caused by fungi of half-known fungi. Comprehensive control measures should be taken.

First, to choose land with low groundwater level and good drainage as nursery and container seedlings, we must use pathogen-free soil to prepare nutritious soil to adhere to the rotation system, not to cultivate the same kind of seedlings continuously in the same piece of land.

The second is to kill the pathogen. Stem rot is a kind of indigenous pathogen, which usually lives saprophytic life in soil. Before raising seedlings, withered branches, withered leaves and hay can be evenly scattered on the seedbed, ignited and burned, which can kill pathogens in the soil. 25 kg of lime powder or 15 to 20 kg of ferrous sulfate powder can also be applied per mu of nursery land to inhibit pathogens.

The third is to apply rotten fertilizer. Fertilizers are mainly farm manure, supplemented by chemical fertilizer. Garbage compost, compost and barnyard manure may carry bacteria and should be composted and fermented before use.

Fourth, building a shade shed in the high temperature season can reduce the temperature of the seedbed and reduce the incidence by more than 85%.

Fifth, improve the disease resistance of seedlings, timely ploughing weeding, interseedling, topdressing to make the seedlings unearthed neatly and grow healthily. At the beginning of seedling emergence, the seedlings were sprayed with 50 to 75 kg Bordeaux solution per mu of nursery to form a protective film on the appearance of seedlings to prevent the invasion of bacteria. After the onset of the disease, remove the diseased seedlings in time, and sprinkle lime powder around the diseased seedlings to prevent spread.