aphis gossypii biological control

japonica and parasitism by Allothrombium and hymenopterous parasitoids play only a minor role. C.septempunctata developed most rapidly at 35°C, with a preimaginal period of 10.8 d. The highest survival from egg to adult (47%) was obtained at 25°C. In August 1994 and 1995 classical biological control releases were made in cotton in the San Joaquin Valley, California, with an Arkansas strain of the entomopathogenic fungus, Neozygites fresenii, a pathogen of the cotton aphid, Aphis gossypii. The relationship of temperature with the relative mortality rate of each pre-oviposition stage and each adult age class was described with parabolas.

Cotton aphid ( Aphis gossypii Glover) is the key insect pest of seedling cotton ( Gossypium hirsutum L. ) in China, particularly in the North China cotton region. Comparison to similar records from other crops indicates a relatively high heat tolerance of A. gossypii under favorable conditions. The functional responses are incorporated in the simulation model of C.septempunctata-A. All functional responses were of type 11 and were adequately described by Rogers' random predator equation. gossypii biological control but also advantageous with respect to labor requirement, fiber and seed quality, and suppression of the cotton bollworm and verticillium wilt by cultural practices. The objective of this study is (1) to better understand and quantify the major processes in C. The simulated and observed data were in reasonable agreement at all levels, though discrepancies increased with the level of scale. The model was tested and evaluated at three levels of the system complexity: laboratory, field cage and open field. For its validation, field work is required. : s.n.] High relative rate of population increase at 25°C resulted in a daily population increase of 47% and a doubling time of 1.8 d, illustrating the tremendous growth capacity of A. Six submodels were distinguished: cotton aphid, seven-spot beetle, predator-prey interaction, parasitism, cotton plant, and abiotic factors. journal = "Journal of Applied Entomology", https://doi.org/10.1111/j.1439-0418.1992.tb01140.x. ISBN 90-5485-713-7 Subject headings: Aphis gossypii I Coccinella septempunctata I biological control / gossypii, extrapolation of the functional response from single stage interaction in experimental arenas in the laboratory to multiple stage interactions on plants, and a higher mortality for C . Biological control of the cotton aphid by naturally-occurring seven-spot beetle ( Coccinella septempunctata L .) The relationship of temperature with the developmental rate of each life stage (the reciprocal of the stage duration) was described using Logan curves. Oviposition was greatest at 25°C, with a total oviposition of 287.4 eggs per female and a mean oviposition rate of 22.4 eggs per female per day. There was a considerable variation in the latter response curves in different predator-prey stage combinations. Handling rate towards early instar, late instar and adult prey varied with a ratio of about 3:2:1. @article{300934c52ba149d8b5390236cf7b4e8d. / van Steenis, M.J. T1 - Biological control of the cotton aphid, Aphis gossypii Glover (Hom., Aphididae): pre-introduction evaluation of natural enemies. The first experiment addressed the effect of five temperatures (15, 20, 25, 30 and 35 ± 0.5°C) on the beetle bionomics, while the second one addressed the effect of food quantity on the beetle bionomics at a temperature of 25°C. The data gathered are used to construct a simulation model of C.septempunctata population dynamics in cotton.

Functional responses of five foraging stages of C. By continuing you agree to the use of cookies. https://doi.org/10.1016/S1049-9644(02)00109-3. Adaptations for the field cage level were density dependence of wing induction and reproduction of A . septempunctata than observed in the laboratory. All rights reserved. Life table parameters of the cotton aphid were determined at 10, 15, 20, 25, 30 and 35 ± 0.5°C in the laboratory (Chapter 2). Dispersal of foraging seven-spot beetles from wheat into cotton was modelled as a diffusion process. N. fresenii persisted and spread in the aphid population until early October 1994 and late September 1995. - With summary in Dutch and Chinese. : Xia - ISBN 9789054857136 - 173: Department(s) Theoretical Production Ecology PE&RC: Publication type Observations should be also made for effectiveness and profitability of the proposed strategy for further improvement and development of cotton cropping systems in North China. Threshold temperatures for development of eggs, larvae, pupae and adults ranged from 10.9 to 13.9°C, with 12.6°C for the entire life span; and thermal constants were 42.0, 103.7, 63.6 and 302.9 D°, respectively. Both methods were successful in introducing N. fresenii to cotton aphids in California; however, higher prevalence of fungal infection resulted with the cadaver treatments. By continuing you agree to the use of cookies. The relationship of temperature with the mean reproductive rate of each adult age class was described using the Weibull model. septempunctata plays a key role in controlling A. gossypii in cotton monoculture, but its numbers increase too late to guarantee a sufficient biological control. Copyright © 2002 Elsevier Science (USA). The objective of this study was to apply a biological control program on cucumber crop under greenhouse conditions, using biological control agents compared with insecticides to control the cotton aphid, Aphis gossypii Glover. Development of A. The search rate increased linearly from 15 to 35°C with a factor of 3-8. Glasshouse Crops Research Station, Naaldwijk, The Netherlands. At each level of complexity, processes were added to the model, based on discrepancies between "original model" behaviors and observations, and additional experimentation. gossypii populations, temporal dynamics of C.septempunctata populations on wheat, seven-spot beetle dispersal from wheat into cotton, predator-prey interaction on cotton, cotton plant, and abiotic factors. Immigrating numbers of seven- spot beetle adults is the key factor.

Based on the model of Chapter 5, a simulation model of the spatio-temporal dynamics of the coccinellid-aphid system in cotton-wheat intercropping was developed in Chapter 6. A. gossypii population growth is temperature. The relationship between temperature and the developmental rate of each life stage was described with Logan curves. Simulations at the open field level show that C. - With réf. Two release methods were compared: dried N. fresenii-infected cotton aphid “cadavers” and chamber inoculation of A. gossypii. Biological control of the cotton aphid, Aphis gossypii Glover (Hom., Aphididae): pre-introduction evaluation of natural enemies. In addition to the processes common in cotton monoculture and cotton-wheat intercrop, processes related to the cotton-wheat intercrop were experimentally characterized and included: (a) immigration of alate aphids into intercropped cotton and seven-spot beetle adults into intercropped wheat; (b) prey density-dependent emigration of seven-spot beetle adults from ripening wheat by flight; (c) prey density-dependent dispersal of foraging predators from wheat into cotton by walking; (d) time-dependent parasitization in apterous aphids and seven-spot beetle pupae; and (e) accumulated (D°)-driven cotton canopy growth.

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