Effect of Potato Variety, Temperature of Storage and Gamma Rays on the Development of Infestation by Phthorimaea operculella (Zeller) in Potato Tuber Solanum tuberosum L.

Naim S. Deab, Ayad A. Al-Taweel, Mohammad K. Al-Jaboori


The effect of potato variety, temperature and gamma rays on development of infestation by potato tuber moth Phthorimaea operculella (Zeller) in potato tuber Solanum tuberosum L. was studied. Artificial infestation by PTM was carried for the three varieties (Desiree,Diamant and Romano), then the varieties were exposed to three doses of gamma rays (80,120,160 Gray in addition to the control), then stored at two different temperatures (5, 15ºC). The results of this investigation showed that the variety Romano illustrated significantly the lowest average number of larvae which was 6.25 in its tuber in comparison with the other two varieties. Furthermore, temperature 5ºC reduced the number of living larvae to zero in all varieties studied during the storage and adaptation periods which were four months. The dose 160 Gray of gamma radiation decreased the number of surviving larvae to 0.55 when the potato tuber was stored at 15ºC.

الكلمات المفتاحية

Phthorimaea operculella ; gamma rays,storage temperature

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