The comprehensive control technology of leek maggot has achieved results.

??? The car company is in the ten thousand mu leek base in Leting Town, Leting County, Hebei Province, turning a few corners, but still can't see the edge of the base. In the exposed arch shed, dark green leeks are growing roots, accumulating strength for the exuberant growth of the peak period.

At the edge of several leek fields in Xiaozhuang Village, Laoting Town, the expert team of the national public welfare industry (agriculture) scientific research project "Research and demonstration of Integrated Control techniques of crop Root maggot pests" is carefully observing the occurrence of leek maggots in the field. Different brands are erected in the leek fields of the same variety and adjacent plots, indicating that the field uses different techniques to monitor and control a kind of pest in the leek fields-leek maggots.

Leek maggot is a common name for the larva of Mushroom mosquito. Leek late eye mushroom mosquitoes harm more than 30 kinds of vegetables, of which leek is the most serious, resulting in a yield loss of 20% to 30%, up to 80%. In other words, for leeks, suffering from a disaster of leek maggots, they may face the threat of almost extinction.

"most of the leek maggots gather in the leek bulbs and roots and other places hidden damage, resulting in underground rot, aboveground pier wilting, withered." Wei Guoshu, an expert on the project team and a professor at Hebei Agricultural University, leaned over a clump of leeks and pointed to a black armyworm board slightly above the ground.

"the armyworm board is usually yellow, right?" The reporter asked.

"We found that the late-eye mushroom mosquito of leek tends to be black, so we used a black armyworm board. Like the general yellow board, it is also double-sided glue. " Wei Guoshu explained.

In a leek field marked "black armyworm board monitoring and trapping adult worm technology", the reporter saw that in a field of about 4 minutes of land, about 6 or 7 armyworm boards were standing neatly: perpendicular to the ground, short-sided grounding, facing south and north, all less than half a meter from the ground. Take a closer look at these black armyworm boards, the most one has been glued to more than 200 chives of mushroom mosquito adults.

"generally speaking, when we talk about pests, the first thing that comes to mind is medication. Leek maggots are used to irrigation roots to control larvae, while ignoring the importance of pest monitoring and adult control." Wei Guoshu told reporters that in the past, researchers were not very clear about the occurrence regularity of leek maggots, such as several generations a year, overwintering and summer, and there was great blindness in the prevention and control of leek maggots.

Wei Guoshu said that because leek maggots often do harm to leek bulbs and rhizomes, it is not only difficult to ensure the accuracy of the data by observing the damage, but also does great damage to the growth of leek.

With the help of the black armyworm board, we can not only monitor the occurrence of leek maggots, but also effectively trap the adults of toadstool mosquitoes. "killing a pair of adults can reduce hundreds of larvae." "so we came up with the idea of using armyworm boards to monitor the number of adults." He told reporters that under the joint research of experts from Hunan University, Hubei Agricultural University, Hebei Plant Protection Institute, Hebei Agricultural University, and other scientific research institutes, the team has basically found out the occurrence regularity of leek maggots: six generations a year generally occur in the greenhouse, and five generations occur in land planting, with peak periods from April to June in spring and September to October in autumn.

"after figuring out the occurrence pattern of late-eyed mushroom mosquitoes in leek, farmers no longer have to blindly fill the roots with drugs." At the seminar on the technical achievements of the project, Zhang Youjun, a researcher at the Institute of vegetables and Flowers of the Chinese Academy of Agricultural Sciences, put forward the concept of "summer insects in spring and winter insects in autumn": about 7-10 days after the peak of adults in spring and 7 days after the peak in autumn. timely soil application to control larvae, harvest leek tested no pesticide residues, the appropriate time to use medicine is very good.

"A black armyworm board costs about 1.6 yuan, and the investment in a greenhouse can achieve such good results with less than 10 yuan." Hong Dawei, a graduate student at Hebei Agricultural University, has been concerned about the prevention and control of leek diseases and insect pests, and he was "surprised" by the effect of black armyworm monitoring and trapping technology.

In addition to this small "blackboard", a study by the staff of the Laoting County Bureau of Agriculture and Animal Husbandry found that the organic fertilizer made from biogas residue also had an unexpected effect on the control of leek maggots. Not far from the demonstration field of "black armyworm board monitoring and trapping adult worm technology", it is a demonstration field of "biogas liquid organic fertilizer prevention and control technology". There is no armyworm board in the field, and the leek is not obviously harmed by leek maggots.

Clean energy is one of the five agricultural dragon industries in Laoting County. In the implementation of large-scale straw biogas gas supply project, the organic fertilizer made from biogas slurry and biogas residue was applied to the leek field. The results showed that the leek grew well, the leaves were thick, and the insect pests were greatly reduced.

Li Weibo, deputy director of the Bureau of Agriculture and Animal Husbandry of Laoting County, introduced to the reporter this technology called "Biogas slurry to improve the suitable soil environment of Mushroom mosquitoes in Chinese chives." during the leek production season, 2000 kilograms of biogas liquid per mu is flushed with water, once every 10 days, and twice per stubble, which can not only control the damage of leek maggots, but also improve the quality and taste of chives.

"this technology deserves attention and further research, and if its mechanism can be understood, it may promote a new change in the rural clean energy industry." Zhang Guoliang, director of the Energy Ecology Department of the Science and Education Department of the Ministry of Agriculture, said.