The damage of sweet potato leaf roller
Sweet potato roll leafworm, alias sweet potato wheat moth, mainly harm sweet potatoes, leeks, morning glory and other convolvulaceae plants. The sweet potato leaf leafworm larvae feed on the leaves after hatching, and the larvae have a total of 4 instars. The action is lively and jumps to the ground at a touch. The 2nd to 3rd instar larvae began to spin leaf curls, feeding on the leaves and leaving the epidermis, leaving only reticular veins in severe cases. Larvae can metastasize more than one leaf each year.
Larvae can also harm young shoots and shoots. After the larvae are matured, the larvae are defoliated in the leaf or earth seams. From June to September, it was the period of its occurrence. Humidity is conducive to sweet potato moths occurring at high temperatures. In severe cases, sweet potato leaves are heavily entwined, presenting a "fire phenomenon" and seriously affecting sweet potato yield.
Control methods
1. Chemical control. In the early stage of the emergence of sweetpotato moth larvae, the medicament can be controlled with a targeted medicament and a new high-fat 500-fold liquid spray. The spraying time is appropriate at 4 to 5 pm.
2. Manually kill. When the larvae roll leaves are initially damaged, the larvae in the new leaf roll can be pinched in time or the new roll leaves can be taken out of the field for centralized treatment.
3. Agricultural control. Timely cleaning up the leaves of field stubs, clearing the fields and weeds in the fields, spraying the tree general to spray the overwhelming insect source.
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