aphis gossypii biological control

Biological control of cotton aphid {Aphis gossypii Glover) in cotton (inter) cropping systems in China; a simulation study / XIA Jingyuan. Corresponding Author. Disadvantages of intercropping are decreased fiber and seed quality, increased outbreaks of cotton bollworm ( Helicoverpa armigera Hubner) and verticillium wilt ( Verticillium dahliae Kleb. 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. 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. The objective of this study is (1) to better understand and quantify the major processes in C. The model was tested and evaluated at three levels of the system complexity: laboratory, field cage and open field. gossypii on cotton in North China. septempunctata plays a key role in controlling A. gossypii in cotton monoculture, but its numbers increase too late to guarantee a sufficient biological control. septempunctata on three sizegroups of A. Degree grantor: Agricultural University: Opponent: R. Rabbinge; W. van der Werf: Date issued: 1997: Access: Open Access: Reference(s) The simulated and observed data were in reasonable agreement at all levels, though discrepancies increased with the level of scale. By continuing you agree to the use of cookies. The resulting annual losses amount to 10-15% of the attainable yield. The handling rate showed a curvilinear relation to temperature and was lowest at 15°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.Pre-release samples in both years indicated that N. fresenii was not naturally present in A. gossypii populations in the San Joaquin Valley. Sole reliance on insecticides against the cotton aphid in the past four decades has brought about a rapid development of insecticide resistance, serious outbreaks of key pests, resurgence of secondary pests, and risk for man and environment. Pre-release samples in both years indicated that N. fresenii was not naturally present in A. gossypii populations in the San Joaquin Valley. Simulations show that the low abundance of the cotton aphid in the current cotton-wheat intercropping system is due to a combined effect of increased predation and parasitism, and decreased aphid immigration, of which predation by the seven-spot beetle is the most important. The relationship of temperature with the developmental rate of each life stage (the reciprocal of the stage duration) was described using Logan curves. The relationship of temperature with the relative mortality rate of each pre-oviposition stage and each adult age class was described with parabolas. Both methods were successful in introducing N. fresenii to cotton aphids in California; however, higher prevalence of fungal infection resulted with the cadaver treatments. - With summary in Dutch and Chinese. By continuing you agree to the use of cookies. Go back to site navigation, http://library.wur.nl/WebQuery/wurpubs/37855, Biological control of cotton aphid (Aphis gossypii Glover) in cotton (inter)cropping systems in China : a simulation study, biologische bestrijding, insecten, nuttige insecten, katoen, Aphididae, Coccinellidae, gemengde teelt, tussenteelt, meervoudige teelt, tussenplanting, computersimulatie, simulatie, simulatiemodellen, China, Aphis gossypii, Coccinella septempunctata, Biologische bestrijding van plagen, biological control, insects, beneficial insects, cotton, mixed cropping, intercropping, multiple cropping, interplanting, computer simulation, simulation, simulation models, Biological Control of Pests. 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 . doi = "10.1111/j.1439-0418.1992.tb01140.x". All rights reserved. ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. In some predator-size- groupsprey interactions, handling rate increased consistently with temperature, while in other combinations, the relationship had a maximum at an intermediate temperature. The relationship of temperature with the mean reproductive rate of each adult age class was described using the Weibull model. : s.n.] The data gathered are used to construct a simulation model of A. title = "Biological control of the cotton aphid, Aphis gossypii Glover (Hom., Aphididae): pre-introduction evaluation of natural enemies.". M. J. van Steenis. 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. Thesis Landbouwuniversiteit Wageningen. gossypii were determined in two experiments in the laboratory (Chapter 3). A. septempunctata than observed in the laboratory. Adaptations for the open field level were immigration rates of both insects; time- dependent parasitization of alate immigrants by Allothrombium, apterous aphids by hymenopterous parasitoids and seven-spot beetle pupae by Tetrastichus coccinellae Kurjumov; prey density-dependent departure rate of seven-spot beetle adults; prey density and prey size-group dependent predation by Propylaea japonica (Thungberg); and accumulated (D°)-driven cotton canopy growth. All functional responses were of type 11 and were adequately described by Rogers' random predator equation. 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. Biological Control Despite a number of experimental studies on the natural enemies of A. gossypii (see Natural Enemies), there are few records available of biological control being practised in the field. Biological control of the cotton aphid, Aphis gossypii Glover (Hom., Aphididae): pre-introduction evaluation of natural enemies. Source: Agricultural University. Handling rate increased with 50-100% from one predator stage to the next, but it was somewhat similar in the fourth instar and adult predators. Life history parameters of the seven-spot beetle feeding on A. ISBN 90-5485-713-7 Subject headings: Aphis gossypii I Coccinella septempunctata I biological control / - With réf. Biological control of cotton aphid (Aphis gossypii Glover) in cotton (inter)cropping systems in China : a simulation study: Author(s) Xia, J. - S.l. More research is needed to determine the effect of distance from wheat to cotton strips on immigration of alate aphids into cotton and dispersal of major predators from wheat into cotton. Biological control of the cotton aphid by naturally-occurring seven-spot beetle ( Coccinella septempunctata L .) Simulations at the open field level show that C. For its validation, field work is required.