Chinese cockroaches such as water cockroaches and other large copepods and clumps are mainly harmful to eggs and seedlings. They can pierce the egg membranes, bite or prey on seedlings, and compete with seedlings for oxygen, space, and feed, so when there are When a large number of large copepods and clades, such as Hua Tuo, are bred, the nursery work will suffer a great deal of loss, or even complete failure.
At present, there is no effective method of killing, which is mainly prevention. The hatching ponds and nursery ponds must be disinfected, and the influent water must be strictly filtered to conduct micro-flowing water ecological seedlings.
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