Cattail pest control techniques

Catfish pest control:

1. Black spot disease mainly harms leaves. At the beginning of the disease, there are chlorotic yellow spots on the leaves, which are round or irregular in the later stage. They turn brown and have a ring pattern. The edges sometimes have a yellow-green halo, and the upper black mold layer has a diameter of 5 to 15 mm.

In severe cases, the lesions are connected into pieces, except for the veins, and the whole leaves are yellow. The disease is caused by fungi, the rainy season is serious, the lotus pond or potted crops, and the excessive application of nitrogen fertilizer or the high temperature of summer water, the disease is very serious.

Control methods: strengthen cultivation management and timely remove diseased leaves. Plants with more serious diseases need to be replaced with new soil and planted without any application of nitrogen fertilizer. At the time of onset, 75% of chlorothalonil can be sprayed with 600 to 800 times solution.

2, brown spot damage to lotus leaves. Round spots of 0.5 to 8 mm in diameter appear on the diseased leaves, ranging from light brown to yellowish brown with darker edges. In the later stages of the disease, many black mildew spots were produced on the lesions. The incidence is more serious when it is rainy in autumn. The pathogens mostly overwinter on the debris.

Control method: remove residual leaves and reduce the source of the disease. For serious cases, 50% carbendazim 500 times solution or 80% dasen zinc 500 to 800 times solution can be sprayed.

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