Cabbage is the main vegetable planting species in Yongnian County in spring. Due to the heavy winter rain and snowfall, this spring when the shade is cloudy, together with the reasons for planting and using non-decomposing chicken manure, Cabbage black spot and sclerotia Disease and downy mildew occur more severely. In particular, black spot occurred earlier and heavier than in previous years. Sclerotinia mainly harms the rhizome connection, leading to the death of the whole plant. Black spot and downy mildew mainly damage the leaves. According to a recent survey conducted by the Bureau of Agriculture, the diseased area of ​​cabbage accounted for more than 70% of the planting area, the average incidence rate of melasma disease was 40.5%, the diseased leaf rate was 10.6%, the rate of diseased plants in severe plots was 70%, and the diseased leaf rate was 21.7%; Disease incidence rate of 0.6% to 3.3%, spot up to 5% to 10%; Downy mildew incidence rate of 12.5% ​​to 100%, diseased leaf rate of 1.4 to 8.8%. Currently in the period from the rosette stage to the beginning stage of the bulbous period, the weather forecast still has a cloudy snow and rain process. It is expected that the occurrence of black spot, sclerotia, and downy mildew will increase in the future. It is hoped that the vast number of farmers will effectively strengthen the prevention and control of cabbage diseases and ensure the harvest of bumpy cabbage. The specific measures are as follows:
First, agricultural control. The old yellow leaves attached to the surface of cabbage were removed, and the diseased plants were removed in a timely manner and brought out of the field for centralized destruction. At the same time, attention was paid to cultivating and arranging, increasing the permeability of the field, reducing the re-infestation of pathogens, and controlling the spread of diseases.
Second, ecological control. Reasonably regulate the humidity and temperature of the greenhouse. Timely release of air and humidity, increase the cover, prevent the rapid increase of humidity in the night shed, reduce the condensation time at night, and maintain the relative humidity below 80%.
Third, chemical control.
On sunny days, use 50% more blessing (Rebecca) wettable powder 600 times, or 70% thiophanate-methyl (Kato) wettable powder 600 times plus 50% dimethomorph (Shuanglei) water dispersion The granules were 1500 times liquid, or 57% acryloylzinc (dot) water dispersible granules were 750 times, and were sprayed alternately for 3 to 5 days with an electric sprayer. Can also be used multi-efficacy single agent 6.5% bactericidal (an rot) water agent 300 times, or 21% peracetic acid (9281) water agent 300 times, or 20% sodium dichloroisocyanurate soluble powder 750 times Liquid spray control. In the case of Sclerotinia, it is necessary to spray seedlings and spray the seedlings on the ground.
On cloudy days, 10% chlorothalonil, 10% procymidone, and 10% sclerotinum smoke can be used to prevent smoke. The dosage is 200-250 g/mu.
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