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New Zealand Plant Protection 69 (2016): 305-309

Plant callus response to egg-laying by chorus cicada and its effect on egg hatch

C.A. Rowe, D.P. Logan and P.G. Connolly

ABSTRACT

Chorus cicada, Amphipsalta zelandica (Biosduval), is an endemic species of cicada that is a pest of kiwifruit. Adult female cicadas cause damage to kiwifruit canes when egg laying. The oviposition wound often stimulates the local formation of callus tissue in kiwifruit canes. The effect of egg-nest callusing on the proportion of eggs to hatch successfully was investigated as a potential plant resistance trait for selection. The proportion of callus tissue covering the eggnest and the number of eggs hatched were measured from egg-nests in canes of two kiwifruit cultivars, 'Hayward' and 'Zesy002', and stems of 'Hass' avocado. Egg-nests with more callus tissue had reduced egg hatch in both cultivars of kiwifruit and avocado. The host plant also affected egg hatch, with significantly different hatch rates between the two kiwifruit cultivars and avocado at zero percent callusing.

Keywords: Amphipsalta zelandica, egg-nest callusing, egg hatch, kiwifruit, avocado.

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