Liriomyza sativae is one of the important pests in vegetable production in the city. It has a wide range of occurrence, rapid propagation, many generations and overlapping generations, and it is susceptible to chemical pesticides. In recent years, mining has seriously harmed melons and beans in our city. Vegetables, which affect photosynthesis, can even cause leaf yellowing and whole plant death. In order to seek efficient, low-toxic or non-toxic, long-pharmaceutical pesticides to control L. sativae in order to reduce environmental pollution, protect natural enemies populations from natural control, and mitigate their resistance, it has become a comprehensive pest for vegetables. The important content of governance, this experiment through the use of plant pesticides in the vegetable production base community Victoria Green treasure, to understand the product of the control effect of Liriomyza sativae, for the promotion of large-scale production in the application of scientific basis.
First, test materials and methods
l, the test agent and source Weilubao (0.5% qialuona solution), Hengyang City Institute of biological resources production and provide;
2.5% Kung Fu EC, produced by Bu Nei Men Chemical Industry Co., Ltd., is provided by the plant protection and phytosanitary station.
2. The basic situation of the experimental field is located in Huangzhou Village, Chashan Town, a suburb of the city. The test plot has an area of ​​1.1 mu. The test crops are cucumbers, 12-15 leaves, and 3000 mu per mu. Soil sandy loam, soil fertility uniform.
3, the experimental design consists of 4 treatments, namely:
One-dimensional Lubao solution, mu 225 ml (400 times liquid);
2 dimensional Lubao solution, mu with 150 ml (600 times liquid);
32.5% Kung Fu EC, MU 45 ml (2000 times);
4 blank control.
The randomized block arrangement was repeated three times for a total of 12 plots with an area of ​​58 square meters per plot.
4. Application times, times and methods were applied on the 14th of August during the peak period of Liriomyza sativae larvae. The workers and farmers-16 mannequin-type manual sprayer was sprayed, and 90 kg per mu was sprayed. Positive and negative leaves. When spraying, cover the compartment with plastic film to prevent the chemicals from interfering with each other. Blank control spray water,
5. Investigate the time, number and method of drug efficacy investigation. Before the application of the drug, 3 days and 7 days after the application, the number of live insects was investigated, and the total number of investigations was 3 times. A total of 10 clusters were surveyed in each plot. Three leaves were surveyed in each plot and marked with red paint. A total of 30 clusters and 90 leaves were surveyed for each treatment. The reduction rates and corrective effects of insect populations were calculated for 3 days and 7 days, respectively, and the significance of the last survey was tested.
6. Meteorological conditions Within seven days after application (including the day of application), the daily average temperature is 28.91°C, the average daily relative humidity is 72.75%, and there are three rainy days. The total rainfall is 19.7mm. There is no rain after 36 hours after application.
Second, test results and evaluation
l, test results The test results show that: plant pesticides Wei Lu Bao on vegetables in the case of Liriomyza sativae has a good control effect. Three days after application, Weilubaobao used 225ml, 150ml, and the average corrected control efficacy against Liriomyza sativae was 71.70% and 67.74%, respectively. The average correction effect of 2.5% Kungfu EC with 45ml was 75.86. %; 7 days after application, Wei Lubao uses 225 ml, 150 ml, and the average corrected control efficacy against Liriomyza sativae is 72.51% and 70.02%, respectively, and 2.5% Kung Fu EC with 45 ml average correction effect. It is 76.31%. Significant determination of the effect of calibration and control after 7 days of drug use, F=0.26 2. Evaluation and discussion
1. The plant pesticide Victoria Green has an ideal control effect on the control of Liriomyza sativae. It is recommended to use a concentration of 400-fold to 600-fold, spray evenly when sprayed, and determine whether spraying is needed after 7 days. Secondary drug.
2. It is recommended to expand the demonstration area and strive to promote it as soon as possible in the Hengyang Vegetable Zone.
Test leader: Tang Chunsheng (senior agronomist)
Gao Jiasheng (senior agronomist)
Cui Dezhi (agronomist)
August 30, 1997
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