Biological prevention and control medicament for evergestis extimalis scopoli larvae, as well as preparation method and application method of biological prevention and control medicament

Abstract

The invention relates to the technical field of agricultural pest control, in particular to a biological prevention and control medicament for controlling evergestis extimalis scopoli, as well as a preparation method and an application method of the biological prevention and control medicament. The biological prevention and control medicament adopts ice-nucleation active bacteria as an effective active ingredient, wherein the content of the ice-nucleation active bacteria is 1 to 90 percent of the total weight, and the ice-nucleation active bacteria are one or the mixture of Pseudomonassyringae and Erwiniapyrifoliae; Pseudomonassyringae as well as Erwiniapyrifoliae is 0.1 to 99.9 wt% of the mixture; the ice-nucleation active bacteria are made into missible oil, microemulsion, emulsion oil in water, an aqueous solution, suspension concentrate, an oil solution, oil miscible flowable concentrate, microcapsule suspension or water dispersible granules under the condition that additives are added or not added. The undercooling point of overwintering larvae of evergestis extimalis scopoli is raised by utilizing the ice-nucleation active bacteria, so that the overwintering larvae freeze to death or are injured due to cold at a relatively high temperature during an overwintering period, that is, the next year pest source is reduced. Therefore, the pollution-free, low-toxic and environment-friendly controlling purposes are realized, and the controlling effect is realized.

Description

technical field

[0001] The invention relates to the technical field of agricultural disease and insect pest control, in particular to a biological control agent for preventing and controlling A. fennel, a preparation method and a use method thereof. Background technique

[0002] Evergestisextimalis Scopli belongs to the family Lepidoptera, Pyralidida. Also known as rape horn borer, fennel borer, and rape borer, it is mainly distributed in northern areas such as Qinghai, Gansu, Ningxia, Inner Mongolia and Heilongjiang, and abroad in North Korea, Japan, the United States and Northwest Asia. Mainly harm fennel, beet, cabbage, rape, shepherd's purse, radish, cabbage, mustard and other plants. On spring rapeseed, it is mainly harmed by larvae digging through siliques and eating grains. In recent years, the harm of hornwort has shown a trend of "spreading from low altitudes to high altitudes in the Haidong rapeseed planting area of ​​Qinghai Province".

[0003] The control of p...

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