At present, red pods, scorpion sips, dark leaves, and other premature lychees have been pumped in succession. This is the time most likely to infect phytophthora infestans. If there are rainy days in the past, a white phytophthora layer will appear on the flower spikes. Dry off, reduce flowering rate, affect fruit setting. Therefore, the premature lychee should prevent and cure the disease in time to protect the spike. Specific prevention methods are as follows:
When the early litchi spikelet just sprouts and the spike length is about 5-10 cm, the spikes grow into complete branches. When the buds begin to swell, the leaves are sprayed once with 1000 times 80% mancozeb aqueous solution, or 800 times 50 times. % Ephine Mn-Zn aqueous solution, or 1000 times 80% thiophanate-methyl solution, or 800 times 60% Tetramethylammonium Mn solution. After the premature lychee spikes are drawn out, if you encounter rainy days in a continuous day, you should catch 800 times 58% aqueous solution of metalaxyl manganese zinc, or 1000 times 80% aqueous chlorothalonil solution once instantaneous sunny leaves. Spray evenly all branches and spikes inside and outside the crown to start dropping with drops of water.
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