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Study on the Application Effect of Pest-Killing Lamp and Pesticides and Imidicloprid Residues Analysis

Author: HuangYuNan
Tutor: ZhangShaoLing
School: Nanjing Agricultural College
Course: Pomology
Keywords: Pear Pest-killing lamp Psylla Chinensis Pesticide residue Imidacloprid Abamectin
CLC: S436.612
Type: Master's thesis
Year: 2009
Downloads: 20
Quote: 0
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Abstract


Pear is a fruit consumers like. It is also one of the world’s most important fruits. China is the world’s largest producer of pears.At present, more and more agrochemical has been used to improve the appearance quality of pear and prevent plant diseases and insect pests, while the quality safety of pear has already become a major concern for consumers. In our research, we attended to reduce the dosage of pesticide through physical and cultivation method. We studied the method of determination of residual imidacloprid and abamectin on pear, and studied the degradation character of Imidacloprid left-over on pear.The results are as follows:1. The actual effect of frequoscillation pest-killing lamp in pear orchard had been studied in this paper. The experimentation was arranged in Hengshan bridge,Wujin district,Chang zhou City, Jiang su Province. We had investigated for fifty days in all, from June 5 to October 15. The pests which were killed by frequoscillation pest-killing lamp included 5 orders,14 families and 18 species. The number of insects killed is 3792.81 per light, which included 3765.96 pests and 26.85 beneficial insects. The fastigium of chafer was in June, and the fastigium of Lepidoptera pest was in July. Pest-killing lamp can significantly decrease the base of the number of insects of contemporary and next generation through killing lots of mature insects. So the farmer reduced the frequency of applying agrochemical. Compared with the pear orchard without pest-killing lamp, it can economize 71.98 RMB/667 m2.Pest-killing lamp has significant effect in killing pests and it should be applied more widely in fruit production.2. The preventive effect of Psylla Chinensis low instar nymphs and aged instar nymphs has been studied with different density of imidacloprid and abamectin. We found the drug resistance of various instar nymphs are different. The low instar nymphs is more sensitive to the pesticide, while the aged instar nymphs have strong resistance to the pesticide. More and more slime, which excreted as the pest age grows, increases the difficulty to prevent the insect pests. Compared with imidacloprid, abamectin is quicker in efficiency. The control effect of abamectin is 93.76% one day after spraying. While 11 day after spraying, the control effect of abamectin and imidacloprid are all over 86%. Further more, it is proved that,0.3% washing powder accession to medicament can destroy the slime excreted by Psylla Chinensis, and enhance the preventive effect substantially.3. Detecting method of imidacloprid and abamectin based on pear. Rate of recovery of both medicament was 93.08-113.02%. The relative standard deviation of imidacloprid was 1.7-4.8%, the quantitative restrictions can reach 0.1 ppm. While the relative standard deviation of abamectin was 5.15-8.60%, the quantitative restrictions can reach 0.01 ppm. They can meet requirements of left-over set by the state or the ministry. The pre-treatment and detective techniques established is easy for use and convenient to sampling of large quantities.4. Based on the method of one spraying and multiple sampling, the author studied left-over dynamics of 10% imidacloprid wp in pear. It is shown that the residual dynamics equation of imidacloprid 1500 times diluted in pear pericarp and the flesh are Ct=1.561e-0.072t and Ct=0.079e-0.111t, respectively, the relative modulus R are 0.962 and 0.933, respectively. The residual dynamics of imidacloprid in pear fruit keeps well with the first order kinetic equation, and with good correlation. The half life is 9.68 d and 5.39 d. The preparatory result showed the residual of imidacloprid eliminated more slowly.5. Three modes in field were designed (general, added times, added dosage).Through detecting, the results were that the imidacloprid in pear flesh in all three modes were zero. When we sprayed two times, the final residues of imidacloprid 1000 times diluted and 1500 times diluted in pear pericarp are 0.225 ppm and 0.031 ppm respectively. The imidacloprid residues in different part of fruit is affected by times of spraying, and all of them did not exceed the national MRL standards. Further more, the residues in pear pericarp are much higher than that in pear flesh obviously, which shows that the residues in pear is mainly in pear pericarp, while the amount of pesticide that seeps into pear flesh is little.6. In our research, pesticide residue of bagged pears is lower than those not bagged. Two hours after spraying with 1000 times diluted, the residues in bagged pear pericarp is 0.072 ppm, which is 1/30 times of that in unbagged pear. The result shows that bagging pears is obviously a cultivar method to reduce the residues of imidacloprid in pear fruit.

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CLC: > Agricultural Sciences > Plant Protection > Pest and Disease Control > Horticultural Crops Pest and Disease Control > Fruit tree pests and diseases > Pome pests and diseases > Pear pests and diseases
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