In July and August of this year, the phone number of the fruit farmers was continuously received, reflecting the phenomenon that the pear mealworm bags attacked the pear fruit surface. In order to understand the occurrence of yellow mealworms in pear trees, our team of experts successively conducted investigations in key pear areas such as Jinzhou, Zhaoxian and Xinji. It was found that this year's tenebrio was not heavy, occurred slightly, and the population density was small. Individual townships were overemphasized, and the occurrence of yellow mealworms drilling bags phenomenon.
The reasons for the overemphasis of pear mealworms in individual townships are as follows: First, the technology and quality of bagging are not relevant. Some fruit farmers use self-made double-layer newspaper bags, which are thicker and less likely to be pinched. In addition, the Zhakou iron wire is generally short and hard, and the easy-to-open can ring is also wide, and it is not easy to tightly connect with the bag mouth. Some types of bags are small and thin, easily broken or damaged by wind and rain, providing favorable conditions for the mealworms to drill bags. The second is management reasons. This year, fruit growers are basically using spirotetramat after the pears fall, causing farmers to think that spraying the pesticide does not need to spray other chemicals to control the mealworms, reducing the number of sprayings, causing the occurrence of Tenebrio this year; individual townships In the past year, Tenebrio had appeared to be heavier. This year, the number of eggs of Tenebrio was large, which caused the occurrence of Tenebrio; the occurrence of Tenebrio in this year was light; some of the growers relaxed the control of pests and diseases, resulting in inadequate management, resulting in the occurrence of Tenebrio; Serious brown spot disease occurred in the tree, resulting in a large number of fallen leaves and fruit drop. The fruit grower did not timely and properly handle fallen leaves and fruit drop, which directly caused the occurrence and spread of Tenebrio. In addition, prevention and control are also an important reason. For the control of Tenebrio, spray must pay attention to spray the trunk and large, medium and small branches. The specific measures are as follows:
1. Scrape the bark. After the fruit trees are defoliated, the old rough skin is carefully scraped before the germination, the residues on the tree body are removed, and the trunk cracks are cleaned to eliminate the overwintering eggs. To completely remove the rotten fruit and shredded paper bags in the park and burn them centrally or deeply, it is also effective in preventing and curing pear hibiscus and scab.
2. Chemical control. From late April to early May, when the pears fell, the mealworms gradually changed their branches, but at this time it was the time when a large number of natural enemies settled in the trees. In the middle and late May, before the Yam bagging, carefully kill the insecticide and add the fungicide again. After the medicine is dry, it can be bagged. When bagging must be serious, to ensure the quality of bagging, tie must be important. At the beginning of June, 1 drug was applied before the wheat harvest. At the beginning of June, it was Tenebrio's successive drilling period, and the wheat harvest lasted for a long time. The fruit growers had no time to take into account the fruit trees. If this medicine is not in place, it will leave 10 days of easy-drilling time for Tenebrio. From July to August, with the increase of temperature, the occurrence of pear hibiscus is decreasing. However, after entering the rainy season, the disease has spread and occurred. Can be combined with other pest control and the occurrence of the tenebrio in the garden, as appropriate 1-2 times the drug. In addition, during the growth period, it is possible to unpack bags to check the condition of the mealworms. When the bag is unwrapped, the inspection rate is about 5%, as long as you check the upper and lower wire and pear shoulders. If the mealworms rate is high and the damage is relatively light (have not caused black spots, affecting the quality of the fruit), then the bag can be solved once more. Pay attention to the bag under the solution must be burned, the other with a new bag fruit (3-5 days to complete), will not have a greater impact on pear color.
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