Reference Report for IND20431217
| Title: | Indiana soybean system model (ISSM): II. Mexican bean beetle model development, integration and evaluation |
| Authors: | Nagarajan, K., O'Neil, R.J., Edwards, C.R., Lowenberg-DeBoer, J. |
| Source: | Agric. Syst. 1994, 45(3):291-313 |
| Abstract: | The population dynamics of Epilachna varivestis was simulated using an age-structured, distributed delay model. This model was integrated with a soyabean crop model as part of the Indiana soyabean system model (ISSM). The model was able to capture the essential aspects of pest dynamics. Life table statistics based on simulation results were close to observed values from laboratory and field experiments in Indiana. Simulated E. varivestis population patterns and peak values were in agreement with observed data, but differences were greater for immature E. varivestis than for adults. Incorporation of mortality due to individual rainstorms and other weather events, and the effect of alternate hosts and movement seemed to be important for simulating soyabean production in a specific field. The effects of crop variety, planting dates, weather and insect influx patterns on soyabean yield were evaluated using the model. The soyabean variety Williams 82 was more susceptible to yield loss from E. varivestis infestation, than the earlier maturing Century 84. This is due to the coincidence of the vulnerable crop stage (pod setting and seed filling) with the occurrence of peak populations of E. varivestis. Late planting is recommended to avoid this and for maximum yield, monitoring of insect influx is also claimed to be important. |
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