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Responses by the brown planthopper, N ilaparvata lugens , to conspecific density on resistant and susceptible rice varieties
Author(s) -
Horgan Finbarr G.,
Naik Bhaskar S.,
Iswanto Eko Hari,
Almazan Maria Liberty P.,
Ramal Angelee Fame,
Bernal Carmencita C.
Publication year - 2016
Publication title -
entomologia experimentalis et applicata
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.765
H-Index - 83
eISSN - 1570-7458
pISSN - 0013-8703
DOI - 10.1111/eea.12400
Subject(s) - brown planthopper , biology , nymph , intraspecific competition , competition (biology) , population density , planthopper , homoptera , population , agronomy , botany , pest analysis , ecology , hemiptera , biochemistry , demography , gene , sociology
This study examines the nature of intraspecific interactions among N ilaparvata lugens ( S tål) ( H emiptera: D elphacidae) planthoppers feeding on resistant and susceptible rice varieties. Planthopper nymphs produced less honeydew and gained less weight when feeding on rice variety IR 62 (resistant) compared to susceptible rice varieties. A series of bioassays was conducted that varied N . lugens nymph densities on IR 62 and IR 22 (susceptible). Increasing nymph density facilitated feeding by conspecifics; however, intraspecific competition increased mortality of nymphs on IR 62 (but rarely on IR 22). Furthermore, nymph weights declined with increasing conspecific density on IR 22, and the effects were weak on IR 62. More female nymphs than males survived on IR 62 but this was not affected by density. Nitrogenous fertilizer increased competition among N . lugens on young plants of IR 22, but not on IR 62. Results indicate that nymphs have a low efficiency in accessing resources when feeding on IR 62, even where the plants have received fertilizer. Female‐biased survival and biomass compensation for mortality may promote population recovery after development on the resistant plant and accelerate adaptation to the resistant variety.