The Effect Of Neem Fruit And Its Extracts On Vegetable Pests

This paper aims to extract neem fruits and preventive effect on Vegetable Pests. First, extract, calculations to determine the azadirachtin content of neem fruit, and secondly, with the resulting neem fruit raw powder and 5% of azadirachtin conduct field efficacy trials, prevention and control of soil pests and vegetables Pieris. Finally obtained the following results:neem fruit raw powder and 5% of azadirachtin against vegetable pests have a strong feeding, avoidance of action, and with the increase of the applied dose, aversion effect is also increasingly obvious. This experiment provides some supporting data and theoretical basis for the Neem as a biological source of pesticides to control insect pests of vegetable field efficacy trials.HPLC method to detect the content of azadirachtin neem fruits, which were washed with ethanol and acetonitrile as solvent, the final ethanol as solvent extraction, separation is not good, the response value is not high, it is not recommended to use this The method of extraction. And from acetonitrile as the extraction solvent, the response value to achieve the desired effect, after repeated after three times with acetonitrile as the extraction solvent, the average peak area of 18888140 can be obtained by calculating the neem fruit azadirachtin content of 1319mg/kg. Therefore, the detection azadirachtin neem fruit content in the process, you should use acetonitrile as the extraction agent.Raw powder using neem fruit and leafy potted the grubs control effect test and practical technology. Total repeated six times, the survey twice, and calculate the number of live insects investigation concluded that the efficacy with increasing doses of neem fruit raw powder spraying, the control effect on grubs showed a decreasing trend. And 3% chlorpyrifos granules for grub control effect is the best, can reach 100%. Grubs feeding in to the process of discovery, after chemical treatment pots of grubs feeding significantly reduced, and therefore, the preliminary conclusion, neem fruit raw powder for grubs role of avoidance and refusal. Preliminary tests in laboratory tests to determine the raw powder neem fruit vegetable soil insect grubs feeding, later aversion effect, the use of neem powder on leafy vegetables and raw fruit cucumber field of field efficacy trials of soil insect grubs and mole crickets. Repeat 4 times 2 times survey found that neem fruit vegetable raw powder Pests effect is quite good, and after the administration of neem fruit raw powder, the field of soil pests significantly reduced processing zone cucumbers and leafy vegetables nor any toxic effects on the surrounding environment without any adverse effects, even in soil pests for Huagua field efficacy trials of the observation process, we found that the original powder neem fruit seedling has some effect.Determine the neem fruit and vegetables raw powder for soil insect control effect after having continued to clear 5% azadirachtin cauliflower (broccoli) to larvae of Pieris Pieris control effect, safety, and practical techniques circumstances. After the test was repeated four times, the first time the survey found, with a 5% increase azadirachtin pesticide doses, the effect of prevention was also an increasing trend. After 5% by azadirachtin treatment, Pieris mostly concentrated in cauliflower (broccoli) in the bottom of the blades feeding. The second time the survey found, with a 5% increase azadirachtin dose of administration, and its control effect on Pieris is also increasing.