Development, reproduction, and host preference of Acyrthosiphon pisum (Harris) (Homoptera: Aphididae) on selected lentil genotypes and resistance index of these selected lentil genotypes to pea aphid
Geteneh Mitku, Tebkew Damte
The performance and development, and reproduction of the pea aphid, Acyrthosiphon pisum Harris (Homoptera: Aphididae) was studied on seven lentil genotypes including: Alemaya, R-186, Chalew, ILL-2595, ILL-4422, and ILL-7664. Hence, the current study was conducted to determine host preference, development, and reproduction of pea aphid in six lentils (Lens culinaris Medikus.) genotypes. Six resistant genotypes and one susceptible accession were included in this study. No-choice study was conducted to determine the development, and reproduction while free choice studies were conducted to determine host preference resistance. The pea aphid fed on the ILL-7664, ILL-2595, and Chalew showed longer pre-reproductive and developmental time, and shorter net reproductive and post-reproductive periods. There were differences in aphid preference among lentil genotypes for the dark choice experiment. Mean survival of the pea aphids fed on ILL-7664, ILL-2595, and Chalew was reduced in comparison to pea aphid fed on another test genotypes. Besides the genotypes were tested in field study to get preliminary information on the association between lath house and field performance. This was done by comparing the yield responses to pea aphid resistant lentil genotypes, found from field screening, to those of the corresponding genotypes which evaluated in the lath house. Based on overall plant resistance index (PRI), ILL-7664 was the most resistant, followed by Chalew and Alemaya but in field performance study done to validate lath house experiment, Alemaya tends to be resistant than Chalew and ILL-7664.