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Estimates of Losses Caused in Paddy Due to Rice Hispa, Dicladispa armigera (Oliver) (Coleoptera:Chrysomelidae)


Affiliations
1 Department of Entomology, Chaudhary Sarwan Kumar Himachal Pradesh Krish Vishvavidyalaya (CSKHPKV), Palampur 176 062, India
2 Rice and Wheat Research Centre, CSKHPKV, Malan 176 047, India
 

Studies were undertaken for two consecutive years (kharif 2015 and 2016) at the CSK Himachal Pradesh Krishi Vishvidyalaya, Rice and Wheat Research Centre, Malan (Himachal Pradesh, India) under field conditions using paddy variety ‘Kasturi Basmati’. Losses in paddy due to rice hispa, Dicladispa armigera (Oliver) were quantified in terms of release density (number of adults per tiller) and phenological stages of crop. Results revealed that both these aspects significantly influenced leaf damage as well as yield of paddy. Early stage release (20 DAT, days after transplanting) contributed to maximum leaf damage (69.9 PLDI (per cent leaf damage index)) and at the same time exerted a significant negative influence on various yield components, viz. number of tillers, panicles, grains and grain weight (g) for which the respective regression coefficients were 5.82, 5.73, 441.4 and 8.06, respectively (per 4 rice hills).

Keywords

Grain Number, Grain Weight, Hispa Release Density, Leaf Damage, Panicles, Tillers, Yield Components.
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  • Estimates of Losses Caused in Paddy Due to Rice Hispa, Dicladispa armigera (Oliver) (Coleoptera:Chrysomelidae)

Abstract Views: 179  |  PDF Views: 75

Authors

Urvi Sharma
Department of Entomology, Chaudhary Sarwan Kumar Himachal Pradesh Krish Vishvavidyalaya (CSKHPKV), Palampur 176 062, India
Ajai Srivastava
Rice and Wheat Research Centre, CSKHPKV, Malan 176 047, India

Abstract


Studies were undertaken for two consecutive years (kharif 2015 and 2016) at the CSK Himachal Pradesh Krishi Vishvidyalaya, Rice and Wheat Research Centre, Malan (Himachal Pradesh, India) under field conditions using paddy variety ‘Kasturi Basmati’. Losses in paddy due to rice hispa, Dicladispa armigera (Oliver) were quantified in terms of release density (number of adults per tiller) and phenological stages of crop. Results revealed that both these aspects significantly influenced leaf damage as well as yield of paddy. Early stage release (20 DAT, days after transplanting) contributed to maximum leaf damage (69.9 PLDI (per cent leaf damage index)) and at the same time exerted a significant negative influence on various yield components, viz. number of tillers, panicles, grains and grain weight (g) for which the respective regression coefficients were 5.82, 5.73, 441.4 and 8.06, respectively (per 4 rice hills).

Keywords


Grain Number, Grain Weight, Hispa Release Density, Leaf Damage, Panicles, Tillers, Yield Components.

References





DOI: https://doi.org/10.18520/cs%2Fv115%2Fi8%2F1556-1562