Occurrence and control of diseases and insect pests in Hami melon

I. bacterial leaf spot

Symptoms: in the early stage, watery spots appeared near the veins of the dorsal leaves, which expanded rapidly and became one piece, with a yellow halo on the edge.

Prevention and treatment: at the initial stage of the disease, 77% Dorin 500 times or 3% Zhongshengmycin 800 times foliar spray 2-3 times, once every 4-5 days.

2. Vine blight

Symptoms: in order to harm melon vines, leaves, melon vine disease is often cracked, the surface is dense with small black spots, in serious cases, the disease overflows amber glue.

Occurrence regularity: the disease was more serious when the average temperature was 18 / 25 ℃, soil moisture was high, continuous cropping, poor drainage and weak growth of watermelon were more serious.

Prevention and control methods: 1. Agricultural measures: (1) strictly control soil moisture to avoid excessive water content. (2) reduce the wound of melon and vegetable and reduce the infection rate of pathogen. (3) avoid flooding in the field when the disease occurs.

2. Chemical control: at the initial stage of the disease, the use of 1800 times of 25% Kailun EC or 32.5 times of Amidomal suspension 1500 times 24% should be 2000 times foliar spraying. The frequency of application depends on the occurrence of the disease, usually 2-3 times, once every 3 times every 4 days.