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Effect of nitrogen fertilizer on the intrinsic rate of increase of Hysteroneura setariae (Thomas) (Homoptera: Aphididae) on rice (Oryza sativa L.)

Jahn, G.C., Almazan, L.P., Pacia, J.B.
Environmental entomology 2005 v.34 no.4 pp. 938-943
Hysteroneura, Aphidoidea, body size, mortality, fecundity, insect reproduction, progeny, food plants, Oryza sativa, rice, nitrogen fertilizers, application rate
We studied the intergenerational effects of nitrogen (N) fertilizer applications to rice plants on the size, fecundity, and intrinsic rate of increase (r(m)) of Hysteroneura setariae (Thomas). Treatments consisted of rearing aphids on rice plants receiving 0, 50, 100, and 150% of the standard N fertilizer rates. Adult females produced on the 0 and 150% treatments were transferred to new plants at 0 or 150% N levels to create a matrix of four treatments: 0-0, 0-150, 150-0, and 150-150%. Second-generation aphids produced on 150% N plants had significantly higher survivorship, fecundity, and r(m) regardless of the N treatment of plants that parents fed on. N levels had no observed effect on head width. Aphids reared on 0% N plants whose parents were also reared on 0% N plants had significantly shorter body lengths than aphids on all other treatments, including the 150-0% treatment, indicating that the effect of a high N diet was expressed in a second generation of aphids. Results are discussed in the context of aphid population outbreaks in rice fields and in greenhouses.