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Effect Of Different Host Plants On Spodoptera Exigua Hübner And Occurrence In The Field

Posted on:2006-01-24Degree:MasterType:Thesis
Country:ChinaCandidate:Z L LiFull Text:PDF
GTID:2133360152494278Subject:Agricultural Entomology and Pest Control
Abstract/Summary:PDF Full Text Request
Choice of host plants, development, reproduction, carboxylesterase(CarE) and acetylcholinesterase (AchE) activity, biomechanism of S. exigua Hubner were determined on five host plants: shallot, amaranth, cowpea, water spinach and flowering stem. In addition, the quantitative dynamics of population and the densities difference of S. exigua on different host plants in the field were found out. The results are as follows:1. The test in the laboratory showed: the trend of oviposition choice of S. exigua was evident. The rate of eggs laid on was the highest on shallot, lowest on cowpea.2.The trend of feeding choice of S. exigua first instar larvae was not the same with oviposition choice of female, which was the highest on amaranth, followed by cowpea, shallot, water spinach and flowering stem.3. There were significant differences on the development duration, survival ratio, pupa weight and numbers of the eggs laid per female among the S. exigua feeding on different host plants. Duration of larval stage was the shortest on flowering stem (11.19d) and longest on shallot (12.38d); the highest survival ratio from hatch to eclosion was recorded in S. exigua reared on flowering stem (33.37%), followed by water spinach (25.60%), cowpea (23.81%), amaranth (22.97%) and shallot (21.43%); the highest number of female progeny was recorded on flowering stem, followed by shallot, amaranth, water spinach and cowpea. Survival ratio was correlative significantly to duration of larval stage. There was no relationship between egg duration and host plants and the effects of different host plants on egg hatchability were not distinct. Shallot is the most appropriate in the five host plants.4. Biochemical results showed: rearing for up to third instar larvae on different host...
Keywords/Search Tags:Spodoptera exigua Hubner, host plant, nutrition effect, enzyme activity, quantitative dynamics of population
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