How to prevent arrowhead disease

In recent days, nearly 300 acres of Asphodel striae have gone out of their way in a Sagittarius base. At first glance, most of the leaves turned yellow and dry, and production cuts will be a foregone conclusion.

The disease mainly damages the leaves and petioles. When the leaves are infected, the lesions are round, oval, polygonal, or irregular, ranging in size from yellow-brown to gray-brown, with moire patterns on the surface, ascending concentric layers of gray mold, and clear disease boundaries. The spot has a yellow discoloration area (yellow halos) around the spot. Several lesions often connect with each other to synthesize plaques of various sizes. When the humidity is high, gray bruises (conidial stems and conidia) appear on the spots. When the leaves become yellow and dry. When the petiole was infected, a short-term brown spot appeared. When the humidity was high, the surface of the lesion was gray to dark gray mold.

If a diseased plant is found, the diseased plant residue should be completely removed and burned or buried deeply. The bulb formation period and the expansion period should be changed in time to avoid long-term deep irrigation.

Chemical control shall be carried out at the beginning of the plant's seal line, and at the latest when the disease begins, use 70% thiophanate-methyl (thiophanate) WP + 75% chlorothalonil wettable powder 1000-1500 times in time. 50% mancozeb WP 500 times, 15% rust WP 1000 times, 40% polysulfide 500 times, 1:1.5: (200-250) Bordeaux, 30% oxygen Copper Chloride Suspension 600x, 77% Copper Hydroxide (killable) Suspension 800x, 50% Tuzet Wettable Powder 800x, 69% Ank manganese + 75% Chlorothalonil ( 1:1) 1000-1500 times liquid, 20% tricyclazole wettable powder 1500-2000 times liquid, alternately applied, once every 10-15 days, even spray 2-3 times, before close dense, spray evenly foot. Note that the fog should be fine, if necessary, add 0.1% neutral detergent to increase the adhesiveness of the liquid.


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