Study Of Light Trapping-based Major Pests Control In Ramie Field

On the basis of the results of preliminary experiments, frequency oscillation pest-killing light2and a large area to promote the use of insecticidal lamps as control were selected during2012and2013. To study the main species, population dynamics of insects of ramie field, we investigate the trapping effects of the two light resources on the main pests; we also review the effects of the two light resources on neutral insects and natural enemies. The purpose was to screen the light resource which suitable for use in ramie field. The use of technology in the field of frequency oscillation pest-killing light and field efficacy trials were taken at the same time. The main research results are as follows:1. Insect species trapped by light in ramie fieldPests tapped by light in ramie field of Xianning area during2012and2013, involved Coleoptera, Lepidoptera, Hemiptera, Orthoptera and Homoptera,22families,40species. The maximum number of light trapped was underground pests such as Anomala corpulenta, Holotrichia parallela, Holotrichia oblita, Opatrum subaratum.2. Population dynamics of main insects trapped by light in ramie fieldThe tarpping number of Cocytodes coerulea, Paraglenea fortunei and Agrotis ypsilon during2012and2013were all small, the trapping peak periods of Cocytodes coerulea were early August to early September; the trapping peak periods of Paraglenea fortunei were May and June; the trapping peak periods of Agrotis ypsilon were mid-late May.Scarabs were trapped from mid-April to early September; the emergence peak was from May to July, the largest number was June. In April, mainly were Holotrichia oblita and Maladera orientalis. In May, various scarabs could found under lamps, Holotrichia oblita, Maladera orientalis and Metabolus tumidifrons reached peak, Adoretus tenuimaculatus reached its first peak.Maladera verticalis reached trapping peak at May to June, Anomala corpulenta reached trapping peak at June, Holotrichia oblita and Metabolus tumidifrons disappeared in July, Holotrichia parallela reached trapping peak; in May, mainly were Adoretus tenuimaculatus and Holotrichia parallela, Adoretus tenuimaculatus reached its second peak. The dominant species of scarabs in ramie field were Anomala corpulenta and Holotrichia parallela.Gryllotalpa orientalis reached trapping peak at mid-June to early-August, in2012, the peak of Elateroidea was May11, but in2013, it was July31. The trapping peak of Opatrum subaratum was mid-late June to August; the peak of Physopelta gutta was July to August.Hydrophilidae was the largest number of neutral insects, in2012, it has two peaks Period, were early-May and late-August, in2013, it was late-July to late-August; Dytiscidae has an obvious peak at late-August in2012, but in2013, it was late-May to late-June.Carabidae and Staphylinidae was the largest number of natural enemie insects, in2012, Carabidae has two obvious peak at April29and May5, it was in a small number during2013; in2012, the peak periods of Staphylinidae was early-May to mid-June, it was in a small number during2013; the peak periods of Coccinellidae was mid-late August, the peak periods of Parasitoid wasp was early-mid May, and in2013, it has anthor peak at late-June to early-August; Reduviidae appearance during all period of the experiment, it has no obvious peak.3. Trapping effect of two lightComparison of the trapping effect of two lights in ramie field, the results indicated that the trapping number of most pests of light resource II was more than control, and the trapping number of Hydrophilidae, Dytiscidae, Carabidae, Staphylinidae and Reduviidae was less than control; the data of Natural Enemy/Pest Index of light resource II were less than control during two years experiment. So we consider that the Complex effect of light resource Ⅱ was better than control.4. Impact factor of trapping effect of pests killing lampComparison of the growth rate at different distances from light, we found that the rate of stem’s growth of2meter from light was Significant greater than5,10meter. Comparison of the damage by pests at different distances from light, we found that the damage leaves per plant of5meter from light was Significant greater than2,10meters. Comparison of the trapping number during different weather, we found that the trapping number of Rainy, windy day was farther less than sunny day; the effect of unfavorable weather to trapping number of Lepidoptera was bigger than Coleoptera. Comparison of the trapping number of different plots, we found that the trapping number of scarabs of well Cultivation and management plots was obvious higher than bad Cultivation and management plots5. Field efficacy trialsThe experiment was carried out in xianning area for20%flubendiamide WDG of different concentrations on control of Pareba vesta and Vanessa indica by field trials in2012. The result indicated that the control effects were94.43%to97.59%and87.27%to96.22%in1day after20%flubendiamide WDG for spraying with different concentrations at early larval instars of two pests,94.31%to98.56%and87.17%to97.12%in3to7days after spraying. All better than the control effect of480g/L chlorpyrifos EC, and it showed quick results and the persistent effect that was more than7days.