Nitrogen fertilizer application in maize and its impact on the development of Chilo partellus (Lepidoptera: Pyralidae)
2013
Arshad, M.J. (Bahauddin Zakariya Univ., Multan (Pakistan). Dept. of Entomology) | Freed, S. (Bahauddin Zakariya Univ., Multan (Pakistan). Dept. of Entomology) | Akbar, S. (Bahauddin Zakariya Univ., Multan (Pakistan). Dept. of Entomology) | Akmal, M. | Gul, H.T.
The current experiment was conducted to check the efficacy of different nitrogen doses on the bionomics of maize stem borer Chilo partellus (Lepidoptera: Pyrlidae) under laboratory and field conditions applied on three maize hybrids i.e., KK-8711, KWS-55 and KS-85. The results revealed that the body weight (mg) and frass weight (mg) of larvae positively correlated with nitrogen levels. There was a significant difference in weight gained by larval instars at various nitrogen applications with highest weight (0.085mg/l) at N4 (150KgN/ha) and minimum (0.078mg/l) at N0 (0KgN/ha). Identical results were observed for the frass weight of different larval instars while maximum frass weight i.e., 0.018 mg was recorded for fifth instar fed on KWS-55 with the application of N4, while minimum frass weight of fifth instar i.e., 0.012 mg fed on KK-8711 applied with N0 and N1. Significant difference for weight gained by the larvae on all three hybrids was recorded but 5th instar maximum larval weight 0.078 mg was recorded by feeding on KWS-55 while minimum 0.066 mg on KK-8711. Cumulative field data analysis showed significant difference among the average maize borer/plant at different nitrogen doses (N0-N4). Maximum number of C. partellus (2 larvae/ plant) was found on KWS-55 at (N4) while minimum (0 larvae / plant) was found on KK-8711. The results suggest that the population development of maize borer is dependent on the application of nitrogen doses.
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