Preparation method of soil improvement agent for preventing and treating maize southern leaf blight

Abstract

The invention discloses a preparation method of a soil improvement agent for preventing and treating maize southern leaf blight, and belongs to the field of soil improvement agents. According to the preparation method, a living cicada pupa is first taken; an opening is scratched at the abdomen of the cicada pupa; afterwards, the cicada pupa is put into honey for soaking; after being soaked, the cicada pupa is aired to obtain a solid culture medium; a paecilomyces lilacinus seed solution is uniformly sprinkled on the surface of the solid culture medium to carry out fermentation culture; an obtained substance is dried and ground until lavender downy fungi fully grow, so as to obtain cicada pupa powder covered with paecilomyces lilacinus; subsequently, a waste crab shell is subjected to acid soaking and alkali soaking respectively; after being rinsed and dried, the waste crab shell is mixed with the cicada pupa powder covered with the paecilomyces lilacinus, ammonium dihydrogen phosphate, milk vetch straw, grass carbon and a tea seed cake, so that the soil improvement agent for preventing and treating the maize southern leaf blight can be obtained. The soil improvement agent prepared and obtained by the preparation method can obviously inhibit the growth of a mycelium of helminthosporium maydis, and greatly decreases the morbidity of the maize southern leaf blight; and compared with a conventional chemical insecticide, the soil improvement agent cannot pollute a crop, does not generate drug resistance and is long in prevention and treatment time.

Description

technical field [0001] The invention discloses a preparation method of a soil improver for preventing and treating corn small spot, and belongs to the field of soil improvers. Background technique [0002] Maize disease is the main factor restricting the yield and quality of maize. Corn leaf spot caused by Helminthospora zea is a worldwide fungal disease of maize leaves. In recent years, with the development of the industrialization of fresh corn planting, the renewal of corn varieties and the transformation of the cultivation system, the occurrence of small spot of corn has become increasingly serious in the main corn producing areas of my country. Corn small spot can occur throughout the corn growth period, especially in the warm and humid conditions after the maize plant tassels are most conducive to the occurrence and prevalence of the disease. Generally, the production of susceptible varieties will be reduced by more than 10%, and the production will be reduced by 20%...

AI Technical Summary

Problems solved by technology

[0005] The technical problem mainly solved by the present invention: aiming at the current corn planting area using a single chemical agent to prevent and control corn small spot year after year, which will easily lead to the generation of drug resistance in the field, reduce the control effect, shorten the effective period, and is not conducive to the sustainable development of the environment The problem is to provide a method of using Paecilomyces lilacinus to prepare a soil amendment to prevent and treat small spot of corn. The present invention first takes live cicada pupae, cuts out its abdomen and then soaks it in honey. After soaking, it is dried in the sun to obtain Solid culture medium, evenly spraying Paecilomyces lilacinus seed liquid on the surface of the solid medium for fermentation and cultivation, until it is covered with Vivid victoria lilacinus and then dried and ground to obtain cicada pupae powder covered with Paecilomyces lilacinus, and then Discarded crab shells are acid-soaked and alkali-soaked respectively, rinsed, dried, mixed with cicada pupae powder covered with Paecilomyces lilacinus, ammonium dihydrogen phosphate, milk vetch straw, and peat tea meal to obtain the control corn Soil improver for small spot disease, the soil improver prepared by the invention can significantly inhibit the growth of mycelium of small spot disease of corn, greatly reduce the incidence of small spot disease of corn, and compared with traditional chemical insecticides, it will not pollute Crops do not produce drug resistance, and the control time is long, so they have broad application prospects in the agricultural field