Abstract
laboratory evaluation of the susceptibility of tubers of 12 potato varieties locally available and cultivated in Egypt to infestation by PTM was carried out through the study of its ovipositional and feeding preferences using choice and non -choice tests. For protecting potato tubers from PTM infestation during storage, different concentration of five plant powders were tested as dusts against adults or dusts against neonate larvae. Tuber damage indices as well as persistence indices for tested materials were assessed. The choice test between 12 potato varieties indicated that the highly susceptible varieties were Bern and Nicola; while the moderately susceptible included Glob, Sanorata, Diamonda and Charisma. and the slightly susceptible varieties were Lady Rosetta, Mirakel, Monaliza, Oleva, Singa and CNK-007-021 which showed the lowest number of deposited eggs. The non-choice test showed that all tested varieties were infested by PTM; but the lowest number of eggs was deposited on variety CNK-007-021. Feeding preference indicated that the highest number of penetrating and surviving larvae of PTM was recorded inside tubers of Bern variety followed descendingly by varieties Glob > Charisma -Monaliza > Mirakel > CNK-007-021 > Diamonda > Sanorata > Singa > Nicola. Tubers of CNK-007-021, Nicola, Mirakel, Singa and Charisma varieties recorded the longest duration of the larval stage inside them. Other varieties as Diamonda, Bern and Oleva showed shorter larval duration. Dusting potato tubers with bulb powder of Allium cepa (50% cone. mixed with talcum powder) displayed a highly effective role in the reduction of deposited eggs as well as adult emergence there from. Allium cepa, Pelargonium graveolens and Cymbopogon citratus caused high reduction in larval penetration into treated tubers. Mixture of Pelargoniumor Allium mixed with talcum powder gave good protection for a long storage period (30-40 days).
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