Method for preparing solution for controlling cucumber and tomato disease using albizzia julibrissin extract

Abstract

The present invention relates to a preparation method of silk tree leaf extract aqueous preparation for controlling diseases of cucumber and tomato. Said preparation method mainly includes the following steps: collecting fresh silk tree leaf, drying, pulverizing to obtain powder, using absolute methyl alcohol as extraction solvent, soaking said silk tree leaf powder to make extraction, reduced pressure concentrating the extract to obtain silk tree leaf paste, adding said silk tree leaf paste into distilled water, then placing them in ultrasonic wave generator to make the dried material be suspended, successively using petroleum ether, ethyl acetate and water saturated normal butanol to make respective extraction for 5 times, concentrating the extract and drying to obtain silk tree leaf extract, and dissolving said extract by water so as to obtain the invented product with good effect for preventing downy mildew of cucumber and grey mould of tomato.

Description

technical field [0001] The invention relates to a preparation method in the technical field of pesticides, in particular to a method for preparing water agents for controlling cucumber and tomato diseases by using Albizia Julibrissin extract. Background technique [0002] Cucumber and tomato are the main vegetable varieties loved by the public. Cucumber downy mildew and tomato gray mold are important fungal diseases that have plagued vegetable cultivation, especially facility cultivation in recent years. Generally, the yield can be reduced by 10%-20%. Reduce production by more than 50%. At present, chemical pesticides are generally used to control such diseases, and it has become a consensus on the harm caused by chemical pesticides to the environment and human health, and the resistance of the controlled objects. The purpose of the invention of this patent is to control the occurrence of these two diseases by using the water preparation prepared from the natural non-toxic ...

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Problems solved by technology

[0003] After searching the existing technical literature, it was found that Zhao Boguang published an article in the "Journal of Nanjing Forestry University" (Volume 18, No. 2) entitled: "The antifeeding effect and toxicity of six plant extracts on Pinus massoniana caterpillars" It is reported in the article that the bark extract of Albizia Julibrissin has an antifeedant effect on the larvae of Pinus massoniana caterpillars. The bark of Albizia Julibrissin is used as the raw material, and it is first extracted and degreased by petroleum ether (30-60°C) with a Soxhlet fat extractor. Finally, 95% analytical pure ethanol was used to extract the ethanol extract, but no research was carried out on the leaf extract of Albizia Julibrissin; in further searches, no research reports on the use of leaves of Albizia Julibrissin in preventing and controlling plant diseases were found.