Resistance of Four Potato Varieties to the Potato Tuber Moth, Phthorimaea Operculella (Zell.) in Storage
Insect-free tubers of four potato varieties, namely Kenya Baraka, Anett, Kerrs Pink and Roslin Gucha were exposed to adult Phthorimaea Operculella for 14 days in uncontrolled conditions in storages. On examination of the tubers 16 days after exposure, the percentage of infested tubers was determined: Kenya Baraka—62.50, Anett—77.50, Kerrs Pink—85.00 and Roslin Gucha—86.25%. The larvae made the following mean tunnel lengths: 44.65, 95.33, 88.33 and 104.23 cm in Kenya Baraka, Anett, Kerrs Pink and Roslin Gucha varieties, respectively. Although there were no statistically significant differences in the number of tubers infested (per cent), there were significant differences in the mean length of tunnels made by the larvae in Kenya Baraka and the other three varieties at P < 0.05. The mean number of larvae which survived in 10 tubers were 6.75, 11.25, 15.75 and 18.00 for Kenya Baraka, Anett, Kerrs Pink and Roslin Gucha varieties, respectively. There were statistically significant differences between Kenya Baraka and Kerrs Pink; Kenya Baraka and Roslin Gucha; and Roslin Gucha and Anett varieties (P < 0.05). Thus Roslin Gucha was the least resistant of the four varieties tested, whereas Kenya Baraka emerged as the most resistant variety. The mechanism of resistance in this case was most probably antibiosis.
Key WordsPotato tuber moth resistance larval feeding Phthorimaea Operculella potato varieties
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- Akhade M. N., Tidke P. M. and Patkar M. B. (1970) Control of potato tuber moth Gnorimoschema operculella (Zell.) in Daccan Plateau through insecticides and depth of planting. Indian J. agric. Sci. 40, 1071–1076.Google Scholar
- Dicke F. F. and Penny L. H. (1954) Breeding for resistance to European corn borer. Proc. Hybrid. Corn Indust. Res. Conf. 9, 44–53.Google Scholar
- Kabira J. N. (1979) Factors affecting the dry matter content and cooking quantities of potatoes. Report to the potato Research Specialists Committee, April 1980.Google Scholar
- Ojero M. F. O. (1980) Control of the potato tuber moth Phthorimaea operculella (Zell.) in storage using dust formulated insecticides. Kenya Entomologists Newsl. 11, 15.Google Scholar
- Raman K. V. (1979) Screening for Resistance to Potato Tuber Moth, Vol. VII, No. 5. International Potato Centre Circular, Lima Peru.Google Scholar
- Schreiber K. (1957) Naturally occurring plant resistance factors against Colorado beetle, Leptinotarsa decem-lineata (Say.) and their possible mode of action. Anchter 27, 289–299.Google Scholar
- Weaver M. L., Timm H., Honaka N., Sayre R. N., Reeve R. M., McCread R. M. and Whitehand C. L. (1978b) Potato composition III. Tissue selection and its effect on total nitrogen, free amino acid and enzyme activity (polyphenolase, monophenolase, peroxidase and cata-lase). Am. Potato J. 55, 319–331.CrossRefGoogle Scholar
- Yathom S. (1968) Phenology of the tuber moth, Gnorimoschema operculella (Zell.) in Israel in the spring. Israel J. agric. Res. 18, 89–90.Google Scholar