Effects of Pepper ( Capsicum annuum ) Cultivars on the Biology and Life Table Parameters of Myzus persicae (Sulz.) (Hemi
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Effects of Pepper (Capsicum annuum ) Cultivars on the Biology and Life Table Parameters of Myzus persicae (Sulz.) (Hemiptera: Aphididae) FR LA ROSSA1, A VASICEK2, MC LÓPEZ2 1
Instituto Nacional de Tecnología Agropecuaria, Instituto de Microbiología y Zoología Agrícola, Centro de Investigaciones de Cs. Veter. y Agron, Castelar, Argentina 2 Univ Nacional de La Plata, Fac de Ciencias Agrarias y Forestales, La Plata, Buenos Aires, Argentina
Keywords Demography, host plant suitability, intrinsic rate of natural increase, plant resistance, mortality Correspondence FR La Rossa, Instituto Nacional de Tecnología Agropecuaria, Instituto de Microbiología y Zoología Agrícola, Centro de Investigaciones de Cs. Veter. y Agron, C C 2 5. ( 1 7 1 2) C a s t e l a r , A r g e n t i n a ; [email protected] Edited by André L Lourenção – IAC Received 19 September 2012 and accepted 18 August 2013 Published online: 12 September 2013 * Sociedade Entomológica do Brasil 2013
Abstract Green peach aphids, Myzus persicae (Sulz.) (Hemiptera: Aphididae), obtained from pepper fields, were colonized on susceptible pepper plants in a growth chamber. The development, survivorship, and life table parameters of the green peach aphid were evaluated on nine peppers cultivars as follows: Almuden, Bilano, Bird, Cabezo, de la Sierra, Eppo, Jaen, Raza, and Yatasto at controlled conditions (20±1°C; about 70% RH; 14h photophase). The development times of immatures ranged from 6.1 days on Yatasto to 11.4 days on Jaen, whereas immature survival was close to 100% on all cultivars. The intrinsic rate of increase (r m ) for green peach aphid on Bilano and Yatasto were the highest. Jackknife estimates of r m varied from 0.281 to 0.174 females/female/day on Yatasto and Jaen, respectively. The mean population generation times (T) on these hosts ranged from 13.7 to 22.7 days. The highest net reproductive rates (R 0 ) were on Bird and Bilano (63.8 and 62.89 females/female/generation, respectively) and the lowest on De la Sierra and Almuden (34.1 and 38.7, respectively). Because of the high coefficient of determination (R 2) values in Gompertz and Weibul models, survival data from different cultivars had a good fit to both models. The results pointed Jaen, Almuden, and Raza cultivars as the least suitable host plants, indicating that they were the most resistant to M . persicae among the cultivars we tested.
Introduction The green peach aphid, Myzus persicae (Sulz.), is a generalist species with a worldwide distribution and uses over 40 different plant families as hosts. This species is the most important aphid virus vector, shown to be able to transmit over 100 plant viruses (Blackman & Eastop 2007). In Argentina, M. persicae is a key pest of greenhouse pepper crops (Polack et al 2002) and aphid populations can grow to extremely high levels under favorable environmental conditions in a short time, covering sprouts, leaves, flowers, and fruits. Damages are shown as dehydration, flower buds loss, weakness, and general decline of vegetative growi
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