Rust is a common disease on long bean pods. In some major producing areas, the diseased field rate is 100%, and the diseased leaf rate is about 20%. The main damage is the middle and lower old leaves, stem vines, and pods.
First, the symptoms of diseased leaves, yellow-white spots, a little uplift, gradually expanded after the yellow-brown spots, severe disease Department turned red-brown, long-range look like burning leaves. Finally, the leaves are dry, the function is lost, and the plants are old and die.
Second, the transmission of pathogenic fungi, mostly winter spores with the disease in the field overwintering in the field, through the leaves of the water invade the plants, can be transmitted through wind and rain or irrigation.
Third, the incidence of pathogenic bacteria like warm and humid environment, the incidence of the most suitable weather conditions for the temperature of 23-27 °C, relative humidity of 95%. Peak incidence peaked in the middle and late harvest. Poor crops, poor drainage, and excessively dense planting on the cultivation or plant plots, and poor ventilation and light transmission are heavy.
Fourth, prevention and control measures
1. Strengthen management, comprehensively prevent and cure symptoms, and timely control and control with drugs. Select 20% triadimefon 2000-3000 times wettable powder, 50% carbendazim wettable powder 500 times, 20% difenoconazole microemulsion 2000 times spray, spray again at intervals of 10-15 days .
2. Types of difference, symptomatic prevention
(1) Viral diseases: There are obvious mosaics, yellow spots, and leaf shrinkage on the leaves. Dwarf plants are severe and can not flower or even wilting. Control methods: Maintain suitable humidity in the field. Remove weeds and eradicate worm parasite transmission. Pharmaceutics to prevent and cure poisons. With 10% imidacloprid 2000-3000 times the liquid, spraying 2-3 times to prevent aphids, virus disease occurred in time after the use of virus A, Zhiling Ling and other agents spray control.
(2) Rust: It mainly damages the leaves and begins to appear yellow-green spots on the leaves. There are many small freckles on the back of the leaves, which are slightly raised and gradually enlarged. The mature powder breaks out after being broken into reddish-brown powder and turns black later to form a large lesion. Leaves the leaves scorch off. The prevention and control methods include: removing the residue after harvesting the upper crop, and fully applying the organic fertilizer. Strictly disinfect the seeds. The spray of medicament is sprayed with 1000-fold of 75% Miconazole for 7 times or 2000 times for 10% of Kodak for 2-3 days.
(3) Anthracnose: Occurs at the leaf veins on the leaves, resulting in reddish-brown to black-brown polygonal stripe spots. The petiole vines suffer red dents, round brown dots on the beans, and enlarged round spots. , The edges are light brown to pink. Control measures: Increase organic fertilizer and apply more phosphorus and potassium fertilizer. Pharmacy use 25% Amisida, 10% Shigao, 75% Miconazole and other sprays, alternating use, even spray 3-4 times.
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