In May, loquat has begun to ripen and harvest, this time to do a good job of fruit harvest management, in order to ensure the good quality of the fruit, but also pay attention to the control of loquat yellow caterpillar, so as not to endanger the loquat waiting to be harvested.
Loquat yellow caterpillar body length 9 mm, wingspan 2 l to 26 mm, forewing gray, the center of the middle chamber consisting of erect brown scales of the tumor; the inner and outer lines are black, the sub-terminal line is black toothed, the outer margin hair has 7 neatly arranged black serrated spots, and the hindwings are gray-brown.
Loquat yellow caterpillars harm fruit trees with larvae, and specially select fresh leaves to eat, and eat them in groups in one place, which will eat the leaves one by one. If the harm is serious, in addition to nibbling all the young leaves, it will also shoot young shoots and shoots, as well as the skin of the young stems. The fruit is eaten away, resulting in a decrease in loquat production, weakening the tree, and even dying.
The loquat yellow caterpillar damage period is just the same as the loquat new shoot extraction period, so the fruit farmers did not do a good job in time to prevent and control, when the new shoots are withdrawn, it will cause the loquat yellow caterpillar to be more rampant and the harm area is more.
Control methods of loquat yellow caterpillar
Prune the fruit trees. Based on the principles of dwarfing, ventilation and light transmission, and uniform distribution of main branches, reasonable shape and pruning are carried out. Timely thinning of dense branches and delicate branches, so that the tree body is ventilated and transparent, reducing the hidden habitat environment of the insect mouth.
Clean the orchard. In winter and spring, the dead branches, weeds and overwintering pupae of the garden are removed in time and burned in a concentrated manner. Apply lime in an appropriate amount, scrape the bark and paint white to cut off the wintering host and eliminate the source of wintering insects.
Unleash predators. The natural enemies of loquat yellow caterpillars are thigh wasps, camel wasps, etc., and placing these natural enemies in orchards can maintain the balance of the ecosystem and control the occurrence of loquat yellow caterpillars.
Manual removal. Loquat yellow caterpillar likes to gather together, in the larval base is small, can be used artificial removal method, reduce the source of insects, can play a multiplier effect.
Use of agents. Regularly inspect the orchard, if a large number of diseases and insect pests are found, timely drug control should be carried out. Reference agents are: fungicides: Bordeaux liquid, methyl tolbuzin, bacillus, etc.; insecticides: avermectin, imidacloprid, enemy killing, etc. Herbicides must not be used in orchards.