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Analyses of numerical responses and Main Life Parameters for Determining the Suppression of Amblyseius cucumeris on Panonychus citri

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Agricultural Sciences in China 2005年第5期4卷 368-375页

作者： ZHANGYan-xuan LINJian-zhen JIJie CHENXie KANGYu-mei InstituteofPlantProtection FujianAcademyofAgriculturalSciencesFuzhou350013P.R.China InstituteofCropCultivationandRotation FujianAcademyofAgriculturalSciencesFuzhou350013P.R.China

In this paper, the numeral response and main parameters of experimental population life table were analyzed for determining the suppressing ability of Amblyseius cucumeris on Panonychus citri. The result showed that: (1) Under 21-31°C and 1 - 9 prey densities/leaf fragment condition, the prey consumptions of A. cucumeris increased with the temperature or prey density; (2) In 1:3 predator-prey ratio treatment, the suppression of P. citri (Ro=34.0053; T=19.4369; t=3.8204) was rather weak, it was enhanced as the ratio over 5:30, and the populations of P. citri in these treatments can be fully controlled within 4-5 days; (3) Under 25±1°C, 80-85% RH and 15L: 9D illumination conditions, the net reproductive rate, mean generation duration and the time for population double increase of P. citri (Ro=34.0053; T=19.4369; t=3.8204) were higher than those of A. cucumeris (Ro=21.8750; T=16.8943; t=3.7954). While the intrinsic rate of increase and finite rate of increase of the former (rm=0.1814; λ=1.1989) were lower than those of the latter (rm=0.1826; λ=1.2004). These results indicated that A. cucumeris is a desirable bio-control agent to suppress P. citri at lower population stage in citrus orchard.

关键词： Amblyseius cucumeris Panonychus citri numerical response Parameters of experimental population life table Biological control agent

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Relationships among rat numbers,abundance of oil palm fruit and damage levels to fruit in an oil palm plantation

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Integrative Zoology 2011年第2期6卷 130-139页

作者： Chong Leong PUAN Anne W.GOLDIZEN Mohamed ZAKARIA Mohd N.HAFIDZI Greg S.BAXTER Faculty of Forestry Putra UniversityMalaysia University of Queensland School of Integrative SystemsGattonQueenslandAustralia University of Queensland School of Biological SciencesSt LuciaQueenslandAustralia Faculty of Agriculture Putra UniversityMalaysia University of Queensland School of GeographyPlanning and Environmental ManagementSt LuciaQueenslandAustralia

The relationships between vertebrate pests and crop damage are often complex and difficult to *** palm oil plantations rodents remain the major pests,causing substantial monetary *** present study examined the numerical and functional responses of rodents to changes in the availability of oil palm fruit and the damage associated with that *** the study,200 traps were set in pairs on a 10×10 trapping grid for 3 consecutive nights in each of 6 study plots at 8-week intervals in a 2569 ha oil palm plantation at Labu,Negeri Sembilan state in Peninsular Malaysia over 14 months.A total of 1292 individual rats were captured over 25200 *** were identified,aged,sexed,weighed and *** index of the relative abundance of rats was calculated based on trapping *** to infructescences was assessed at each trap *** of the age of palms,there were positive and significant relationships between the relative abundance of rats and numbers of *** levels of damage to infructescences were significantly correlated with the relative abundance of rats.A steep increase in damage was observed with an increase in mature infructescences,indicating a feeding preference of rats for mature *** both males and females of all rat species,there were weak and non-significant correlations between body condition and infructescence *** results indicated that there was a numerical and a functional response by rats to the availability of palm fruit and a resulting increase in depredation of oil palm *** ways in which this information might aid in future pest control are discussed.

关键词： body condition index fruit damage numerical response oil palms rodent pest

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Predatory Potential of Phytoseiulus macropilis(Banks)Preying on Tetranychus urticae Koch(Acari:Phytoseiidae,Tetranychidae)

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Advances in Entomology 2018年第2期6卷 134-147页

作者： Giselle Christiane Souza-Pimentel Paulo Rebelles Reis Gilberto Rodrigues Liska Marcelo Angelo Cirillo Postgraduate Program Universidade Federal de Lavras-UFLALavrasBrazil Empresa de Pesquisa Agropecuária de Minas Gerais-EPAMIG Sul/EcoCentro LavrasBrazil Universidade Federal do Pampa-UNIPAMPA Rio Grande do SulBrazil Departamento de Ciencias Exatas Universidade Federal de Lavras-UFLALavrasBrazil

The two-spotted spider mite, Tetranychus urticae Koch (Tetranychidae), is considered one of the most important species of pest-mites because it is cosmopolite and polyphagous. This species has been described as attacking over 1,100 plant species in 140 families of economic importance. On the other hand, Phytoseiulus macropilis (Banks) (Phytoseiidae) is a predatory mite of group I, specialist as predatory mite from the Tetranychus genus. Thus, the objective of this work was to evaluate predatory potential of P. macropilis in its different stages—nymphs, female and male adults—preying on T. urticae also in different stages—eggs, larvae, nymphs, and adults—and to know the functional and numerical responses in lab studies. Both the experiments were carried out on arenas made of Jack-bean leaflets’ discs [Canavalia ensiformis (L.)—Fabaceae] with 3 cm in diameter over agar-water at 3% inside 5 cm in diameter uncapped Petri dishes. To know the predatory activity, forty T. urticae and one predatory mite were placed in each arena with the respective phases of the developmental life cycle to be evaluated. To know the potential of predation, the no killed mites were counted after 24 hours. To know the functional and numerical responses, immature T. urticae in densities of 1 to 300/arena were offered for P. macropilis. The results for the predatory potential showed that larvae and male adult of T. urticae were the most killed stages, and the female predatory mites were the one that consumed most prey. The functional response showed a positive and significant correlation, suggesting a type II functional response (convex), a cyrtoid curve rising at a decreasing rate to a plateau, where the consumption remains constant regardless of prey density.

关键词： Agricultural Acarology Functional response numerical response Biological Control

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