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I. Symptoms of diseased leaves are victimized, with dark green water immersed lesions at the beginning, diseased areas contracting, and the leaves turning yellow and withering. When the weather is wet, the lesions are soft and rot, and there are gray creams. Leaf sheath damage was brownish-water immersed lesions, soft rot, and leaf stripping. Damage to bulbs and roots is soft rot, which affects the absorption and accumulation of nutrients.
Second, the incidence of conditions in summer, high temperature, high humidity, low-lying, poor drainage and poor plant growth, excessive harvest, malnutrition, severe disease.
Third, control methods
1. Rotations of cultivated land and nursery areas should be selected within 3 years of land that has not been planted with onion and garlic vegetables.
2. Level up the land and timely renovate the drainage system. After heavy rain, no water will accumulate in the concrete and eliminate the pit.
3, cultivating robust plants such as taking the seedlings when selecting strong seedlings, remove diseased seedlings, pay attention to raising the roots, do not over-harvesting, top dressing after harvest, after summer irrigation irrigation and other control measures, can make plants grow robustly.
4. Before the leaves enter the summer rainfall, the lower yellow leaves should be removed, and the green leaves should be picked up and tied up with the loose and loose bark of the grass to prevent the leaves from touching the ground so that the plants can be ventilated to prevent the occurrence of diseases.
5. Chemical control In mid-July to early August, use 25% metalaxyl WP 600-800 times, 64% WP 500 times, and 0.1%-0.2% copper sulphate to deep-irrigate plants. Rhizomes, or rooting, are all effective when applied to roots.
Occurrence and Prevention of Pansy Disease
The leek is a perennial vegetable, and it occupies a long period of time. With the increase of the continuous cropping period, the source of bacteria is concentrated, and the epidemic disease is harmed more and more seriously. The incidence of individual plots is as high as 70%. For this reason, how to prevent and control the occurrence of epidemic diseases is particularly important, and its occurrence and prevention are described below.