Rape, rapeseed, rape

Symptoms dodge around the rapeseed ground, the suction device into the host tissue, absorbing water and nutrients, causing rape yellow leaves gradually withered.

The pathogen, Crscuta chinensis Lamb., is known as the Chinese dodder, which is a parasitic seed plant. The stems are weak, yellow, and have no chlorophyll. The stems come into contact with the stems of the host to create a suction device that attaches to the host's surface to absorb nutrients. Flowers white, styles 2, headlike, bracts abaxially with ridges, ridges longitudinal, sepals appear angular, stamens and corolla dehiscence alternate, after the capsule is mature, it is wrapped in corolla, and appears cracked when broken.

Transmission routes and disease conditions Dodder seed can be mixed in the host seed and overwintered with organic manure in the soil. Its seed coat is hard and germinates after 1-3 years. It spreads in the field along the edge of the earth and meets the appropriate host. Wreaths are parasitic.

Prevention methods (1) Select seeds to prevent dodder seeds from mixing. (2) Deep-turning the land 21cm to inhibit the germination of Cuscuta seeds. (3) Remove the dodder vines, bring them out of the field and burn them or bury them deeply. (4) Debris, to be extinguished before the seedlings of Cuscuta chinensis do not grow out of the winding stems. (5) Carrying out the high-temperature fermentation of glutinous rice pods so that seeds of cusped seedlings lose their germination power or erosion. (6) Biological control spraying Lubao No. 1 biological preparation, the use concentration requirement contains no less than 30 million viable spores per ml of water, every 667m22-2.5L, spraying after rain or evening and cloudy days, every 7 days 1 Times, continuous prevention and treatment 2-3 times.

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