Gonggan anthracnose is a weak parasitic fungus that generally does not develop in healthy tissues of plants. However, high temperature and rain, high humidity, weak tree, poor ventilation, poor ventilation, and partial application of nitrogen fertilizer are conducive to the occurrence of anthrax. The following are the different prevention and treatment methods for different diseases of Gonggan anthracnose:
First, serious disease orchard: should be timely retracted or short-cut pruning, the pruning of the diseased branches will burn down the same day (in case of rain, you can dig deep ditch and lime landfill, must not be placed in the orchard, road, water source), immediately after pruning Spray protective fungicides to strengthen fertilizer and water management. After the new shoots are pulled out 1-2 cm, spray the first pesticide, spray again 5-7 days, and spray 2-3 times continuously to ensure the normal growth of new shoots, enhance the tree potential, and improve the resistance to stress. If the new shoots continue to appear, the diseased leaves will be cut off and burned in time.
Second, moderate disease orchard: should be properly trimmed, cut off at the junction of the Ministry of Health and the Ministry of Health at 2-3 cm to cut off diseased branches, diseased leaves, burned on the same day. Grasp the spray control, spray once every 5-7 days, rotate the medicine, spray 3-4 times continuously, spray the inner and outer leaves, branches and fruits evenly, inhibit the disease expansion, and ensure the normal growth and development of the fruit of the fruit tree.
Third, mild disease orchard: strengthen disease investigation, timely pick and cut diseased leaf, concentrate on the same day burned, timely spray control, spray once every 7-10 days, continuous spraying 2-3 times.
4. Disease-free area: Strengthen the monitoring of field conditions and management of fertilizer and water, mainly for prevention, and spray protective fungicides such as Dasheng once a month.
V. Sugar orange orchard: It is also necessary to pay attention to the prevention and treatment of citrus anthracnose, timely cutting off the diseased branches, concentrated burning, and timely spraying and prevention.
Application method for controlling citrus anthracnose: According to the occurrence of anthracnose, spray once every 5-10 days, alternately use pesticide bactericide, even spray 3-4 times, must be sprayed after rain before rain, request Choose to use a motorized sprayer or a hand sprayer to spray in a mist and add a spreading agent to prevent rain. Spray the inside and outside of the canopy when applying the medicine. If there are more branches and leaves on the ground, spray the pesticide disinfectant on the ground.
Recommended pesticide fungicides and formulations:
1. 25% prochloraz cream 1000 times + 80% mancozeb wettable powder 500 times; 2, 50% prochloraz manganese salt wettable powder 1500 times + 42% mancozeb suspension 500 times; 10% difenoconazole granules 1000-1500 times +40% chlorothalonil 600-800 times; four, 62% double WP wettable powder 600-800 times; five, 30% copper oxychloride suspension agent 600 -800 times; six, 25% charringer wettable powder 500-800 times; seven, 70% methyl thiophanate wettable powder 700 times + 42% mancozeb suspension 500 times.
The above medicines are sold in all the town stores. Please pay attention to the product quality when purchasing medicines.
tips
Citrus anthracnose has two types of symptoms:
1, acute type (leaf-type) symptoms often start from the tip of the leaf, initially dark green, like the boiled water, the disease, the edge of the health is not obvious, then become yellow or yellow brown, leaf curl The leaves quickly fall off.
2, chronic (leaf type) symptoms appear in the leaves or near the leaf tips of the growing leaves or old leaves, round or nearly round, slightly concave, the lesions are initially yellowish brown, late grayish white, brown edges or Dark brown. The disease and health are obvious.
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