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Resistance of four potato varieties to the potato tuber moth, phthorimaea operculella (zell.) in storage

Published online by Cambridge University Press:  08 April 2017

M. F. O. Ojero  and
J. M. Mueke
M. F. O. Ojero
Affiliation:
National Agricultural Laboratories, P.O. Box 14035, Nairobi, Kenya
J. M. Mueke
Affiliation:
National Agricultural Laboratories, P.O. Box 14035, Nairobi, Kenya
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Abstract

Insect-free tubers of four potato varieties, namely Kenya Baraka, Anett, Kerrs Pink and Roslin Gucha were exposed to adult Phlhorimaea 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.

Keywords

Potato tuber mothresistancelarval feedingPhthorimaea operculellapotato varieties
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 6 , Issue 2 , April 1985 , pp. 205 - 207
Copyright
Copyright © ICIPE 1985

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References

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