Pesticide for cabbage caterpillar and preparation method therefor

[0028] Example 1 The formula of the cabbage caterpillar insecticide of the present invention

[0029] The cabbage caterpillar insecticide of the present invention is composed of the following components in units of mass:

[0030] 4 parts of tiger palm mother liquid, 2 parts of artemisia annua mother liquid, 2 parts of yellow flower tobacco leaf mother liquid, 1 part of lime water, 1 part of salt water, 6 parts of clear water; the said tiger palm mother liquid is 50 parts of tiger palm fragments into 100 Soak in a portion of clear water for 1 hour, and filter the juice to obtain the mother liquor of Tiger Palm grass; the mother liquor of Artemisia annua L. is to soak 50 portions of pieces of Artemisia annua into 100 portions of clear water for 1 hour, and filter the juice to obtain the mother liquor of Artemisia annua; The mother liquor is to soak 10 parts of yellow flower tobacco leaf fragments into 100 parts of clear water for 1 hour, and filter the juice to obtain the mother liquor

[0031] Example 2 Preparation method of Pieris rapae insecticide of the present invention

[0032] The preparation of the Pieris rapae insecticide of the present invention includes the following steps:

[0033] (1) Raw material selection and processing

[0034] Take fresh tiger palm and fresh artemisia annua and cut them into 0.5cm×0.5cm pieces respectively. Take yellow flower tobacco leaves and dry them and cut them into 0.5cm×0.5cm pieces. The moisture content of the dried yellow flower tobacco leaves is 18% or less.

[0035] (2) Prepare mother liquor, and each part is calculated by mass unit:

[0036] ①Soak 50 parts of Tiger Palm grass fragments in 100 parts of clean water for 1 hour, filter and take the juice into Tiger Palm grass mother liquor, and set aside;

[0037] ②Soak 50 parts of Artemisia annua fragments in 100 parts of clean water for 1 hour, filter and take the juice as the mother liquor of Artemisia annua, for use;

[0038] ③Soak 10 parts of yellow flower tobacco leaf fragment

[0043] Example 3 Application of the Pieris rapae insecticide of the present invention on the control of Pieris rapae

[0044] The cabbage caterpillar insecticide prepared in Example 2 was sprayed directly onto the vegetables that are being damaged by cabbage caterpillars using a sprayer.