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New Zealand Plant Protection 68 (2015): 440

Survival and reproduction of Liberibacter-infected tomato potato psyllid reared under cold environmental conditions

W.R.M. Sandanayaka, V.A. Davis and G.P. Walker

ABSTRACT

The tomato potato psyllid (TPP, Bactericera cockerelli) survives on volunteer potatoes growing in frost-free areas in winter in the Auckland region and therefore could transmit Candidatus Liberibacter solanacearum (Lso) to commercial crops. The survival and oviposition of laboratory-reared Lso-infected TPP were tested under four selected environmental conditions: 12:12 h light:dark at 10C; 13:11 h light:dark at 12C; 14:10 h light:dark at 14C; and 15:9 h light:dark at 16C, on excised leaves from volunteer potatoes (grown in the field during winter) and tomato (grown in the glasshouse). One hundred pairs of adult TPP (10 pairs/leaf) were tested on either potato or tomato in each environmental condition for 7 days. Survival of females on potato or tomato was not significantly different between photoperiod but remained unhatched in all tested temperatures. Results revealed that Lso-infected TPP could feed (as indicated by excretory droplets), oviposit and survive on volunteer potatoes in Auckland winter-like conditions and potentially transmit Lso to crops grown in these cooler months.

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