Method for continuously propagating large amount of Cnaphalocrocis medinalis in field

Abstract

The invention provides a method for continuously propagating a large amount of Cnaphalocrocis medinalis in field, which comprises the following steps: (1) building a nylon net room which is 40 meters long and 8 meters wide in a field, dividing the nylon net room into four parts transversely, and continuously sowing seeds or transplanting rice seedlings in the independent divided parts every 25 to 30 days; (2) performing normal field management; (3) inoculating adults of Cnaphalocrocis medinalis into the first isolated part in a high tillering period of rice, and finally allowing 10 to 20 percent of senile larvae or pupae to propagate in the first part; and (4), in the peak emergence period of adults, opening a second isolated nylon net adjacent to the first isolated part for keeping the Cnaphalocrocis medinalis population in the net room going. Thus, larvae of the same age used for doing experiments can be bred continuously and in large amount and supplied continuously.

Description

technical field [0001] The invention relates to the fields of insect feeding and pest control, and provides a method for continuously mass-propagating the rice leaf roller in the field. Background technique [0002] The rice leaf roller Cnaphalocrocis medinalis (Guenee) is a migratory pest, which migrates from Vietnam and other places to the rice fields in southern my country every year, and is one of the most important pests on rice in southern my country (Shepard et al., 1995; Cheng Jiaan, 1996). Since 2000, the pest has become more and more serious in my country, with an average annual occurrence area of ​​more than 20 million hectares and an average annual grain loss of 760,000 tons. Especially in 2007, due to the influence of insect source base, climatic factors, planting conditions and other factors, the rice leaf roller occurred in a large area in the southern rice area of ​​my country, with an occurrence area of ​​25.3 million hectares, which was the year with the la...

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Problems solved by technology

[0004] The purpose of the present invention is to mainly collect the experimental insect sources of traditional rice leaf rollers in natural fields, which are easily affected by the growth state of rice, the natural occurrence of rice leaf rollers and the development progress of larvae, etc., resulting in Insufficient, differences in the physiological state of insect sources, inconsistencies in ages and inaccurate experimental results, etc., provide a method for artificially raising rice leaf rollers in large quantities to obtain insect sources with a large number, ages, and states. Achieving standardization of test insects

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