Temperature effects on life history traits of the corn leaf aphid, Rhopalosiphum maidis (Homoptera: Aphididae) on corn in Taiwan

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The effects of temperature on the life history traits of Rhopalosiphum maidis (Fitch) were determined at 6, 10, 15, 20, 25, 30, and 35±1℃ on corn leaves, Zea mays (L.). At 35℃, only a few nymphs survived and completed development, but all failed to reproduce. Total immature stages from birth to adult decreased as temperature increased from 51.7 d at 6℃ to 5.2 d at 30℃, but became 8.0 d at 35℃. Overall immature development required 119.05 degree-days above 4.44℃. Adult longevity was as high as 26.7 d at 15℃, but significantly declined at 30 and 35℃. The average adult fecundity was as high as 45 offspring at 15 and 20℃, but dropped to 1.8 at 6℃ and 8.6 at 30℃. In general, as temperatures increased, age-specific survivorship (l_x) declined more quickly, but age-specific fecundity (m_x) peaked earlier. At 25℃, the age-specific net maternity (v_x=l_xm_x) was the highest in the early reproductive period, resulting in the highest intrinsic rates of increase (r_m=0.329). At 20-30℃, the values of r_m were significantly higher than those at lower temperatures. The results indicate that corn leaf aphids probably are better adapted in population growth to a wider range of high temperatures in warm regions.
日本応用動物昆虫学会の論文
2006-02-25