Litchi borers are mainly larvae, which attach to the main vein or spike of young leaves behind litchi. The young fruit begins to damage the fruit core during the expansion period, and then damages the fruit pedicle after the fruit develops, resulting in brown midvein of young leaves, cracked epidermis and dead spike top, which affects the fruit quality and yield.
As an important pest of litchi, the damage rate of stem borer is between 20% and 60%. Once you get sick, you can take the following measures to prevent it:
1, agricultural control methods: do a good job of thinning branches and flowers, trim new tender shoots neatly, cut off branches, leaves and flowers with pests, strengthen cultivation management and use fertilizers reasonably.
2. Biological control methods: There are many natural enemies of stem borers in nature, and they will parasitize and prey from late June to 10, which has a certain effect on eliminating stem borers. So at this time, we should pay attention to the use of natural enemies, which can be sprayed less or not, and make full use of the original natural enemies in the orchard.
3. Pesticide control methods: When using pesticides, we should choose the appropriate pesticides according to the orchard situation and fruit tree varieties. In addition, in order to avoid being attacked by stem borers before marketing, pesticides can be sprayed every 20-22 days and 10- 12 days before litchi matures (early-maturing litchi is in the color-changing period and the red-emerging period). Then apply some foliar fertilizer to ensure the nutrition of the tree. 4. Technical control method: adopt the method of "optical drive avoidance" to control. This method is an innovative green control technology, which mainly uses the photophobia of litchi stem borer, uses LED lights with the power of 15W, turns on the lights at 19: 30 in the evening and turns off the lights at 6: 00 in the morning, and installs the LED lights between rows of litchi trees, and installs 65438 in the center of every four trees in litchi orchard. During the use of LED lights, there is no need to apply any pesticides and drugs to the orchard.
Litchi stem borer has a great influence on fruit quality, which not only reduces production, but also affects sales and other issues. Therefore, the prevention and control of this kind of insect must be done in place, so as to prevent problems before they happen and reduce the occurrence in the later period.