- 期刊
- OpenAccess
Influences of Soil Fertility on Spatial Patterns of Aphis Gossypii Glover (Homoptera: Aphididae) Occurred in Bt-cotton Plants
並列摘要
With the widespread planting of bacterium Bacillus thuringiensis (Bt)-cotton, non-target piercing-sucking insects such as Aphis gossypii Glover (Homoptera: Aphididae) have become the main hazard of cotton. Fertilization influences the distribution and population dynamics of aphid seriously. In this study, the effects of Nitrogen (N) and Phosphorus (P) on aphid population density were investigated on Bt-cotton; the combinational impacts of nitrogen and potassium (K) fertilizers on the distribution of aphid were examined as to guide rational fertilization to reduce pests and environmental pollution. Aphid density in cotton plants fertilized with 72 kg/ha N (84.2±22.7 aphids/plant) was significantly higher than fertilized with 0 and 108 kg/ha N (36.7±4.0 and 47.8±18.7 aphids/plant). Compared to cotton plants treated with 23 and 69 kg/ha P, aphid density was higher (61.67±21.08 aphids/plant) in cotton plants treated with 46 kg/ha P. Comparison of spatial distribution of aphid population showed that aphid preferred to suck the sap of bottom fruit branches in cotton plants treated by single K fertilizer and combinational fertilizers of N and K. Thus, these results suggested that proper application of fertilizers should be beneficial to controlling phytophagous insects in Bt-cotton production.