Prevention and cure method

1. Artificial control

(1) It is forbidden to leave seeds on the land of descendants of wheat descendants.

② Sow Artemisia annua in wheat field, and manually pull it out before flowering and fruiting to reduce the provenance.

③ Crop rotation and wheat-cotton rotation are effective measures to reduce the harm of Descurainia sophia.

2. Chemical control

① Before the winter of wheat, in the middle of 165438+ 10, the fields where the offspring are growing can be sprayed with 13% dimethyl tetrachloroacetate solution 150g to 30 ~ 40kg of water, or the control effect can be better with DuPont superstar.

② Spraying 75% superstar suspension 1g and 30kg water at 667m ~ 2 from 2-leaf stage to jointing stage of wheat.

(3) The sowing date is 6-8 leaves, that is, before the jointing stage of wheat. Choose sunny days and spray 72% giant sickle 1.2-2.0g, 50-67ml tarragon with 30kg of water, or 5g of 36% Pentium powder with 30kg of water every 667m, and the control effect is good.