Principle and control of brown spot of lentil

Lentil, Lablab purpureus (Linn.) Sweet, general name lentil, alias falx lentil, rattan bean, along the hedge bean, magpie bean, chabou, moon vegetable, dicotyledonous plant class. There are also many kinds, such as white lentils, purple lentils, oil beans, snake beans, pig ear beans (shaped like pig ears). It is a perennial, twining vine of the genus Lentil of Leguminosae. It's a legume plant.

The principle of lentil brown spot:

Lentil brown spot, also known as brown margin white spot, is mainly harmful to leaves. The leaves are nearly round or irregular brown spots on the front and back, the edges are reddish brown, the diameter is 1-10 mm, and the middle of the lesion becomes grayish white to grayish brown. A grayish-black mildew is produced on the disease spot on the back of the leaf at high humidity. The pathogen overwintered in the soil with the ascomycete, and at the beginning of the following year, the ascospores were produced by the overwintering pathogen, which were transmitted by wind and rain, and the ascospores produced by the disease were transmitted by airflow. The disease is a disease of high temperature and high humidity. Under the condition of high temperature and rainy weather, the temperature is 20-25 ℃ and the relative humidity is higher than 85%.

Prevention and control of brown spot of lentil:

① agricultural measures: rotation with non-legume vegetables for 2 years. Reasonable close planting, increase the application of potash fertilizer, clean the countryside, and burn the diseased and disabled bodies.

② seed disinfection: soak the seeds in cold water for 4 minutes for 5 hours, then transfer to 50 ℃ and soak in warm water for 5 minutes.

③ medicament prevention and cure: in the early stage of the disease, you can choose 80% Dysen zinc wettable powder 500x, or 45% Dysenamine water 1000 times, or 50% thiram wettable powder 600x, or 25% Ridox wettable powder 800x, or 20% carbendazim EC 350x, or 40% aluminum ethyl phosphate wettable powder 200x, or 66.5% preke water 800x. Or 50% gram carbendazim wettable powder 450 times liquid and other spray. Spray once every 10 days for 2 or 3 times in a row.