New Zealand Journal of Crop and Horticultural Science abstracts

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Effects of sowing and harvest dates on carrot rust fly (Psila rosae) damage to carrots in Canterbury, New Zealand

N. A. BERRY
S. D. WRATTEN

Department of Entomology and Animal Ecology
Lincoln University
P. O. Box 84
Canterbury, New Zealand

C. FRAMPTON

Centre for Computing and Biometrics
Lincoln University
P. O. Box 84
Canterbury, New Zealand

Abstract  The effects of manipulating sowing and harvest dates on the degree of carrot rust fly (Psila rosae) damage on carrots (Daucus carota) was investigated at Lincoln University, Canterbury, New Zealand in 1994-95. The proportion of damaged carrots resulting from late sowings (mid November-late December) and harvested before the third carrot rust fly generation was lower than those sown earlier (early-late October). However, a reduction in growing time for later sowing dates resulted in roots which were not of a marketable size. There were low numbers of first-generation flies caught from early November to late December, and very high numbers of third-generation flies caught from late March to late June. An early sowing (October) in combination with a harvest before the peak of third-generation flight activity (mid April-early May) resulted in a higher proportion of marketable carrots.

Keywords  carrot rust fly; Psila rosae; sowing date; harvest date; flight activity; marketable yield; integrated pest management; cultural control methods

New Zealand Journal of Crop and Horticultural Science, 1997, Vol. 25: 109-115

0114-0671/97/2502-0109 $7.00/0 (c) The Royal Society of New Zealand 1997

PDF file of entire paper: medium quality (473K); (scanned from paper original: notes about this process)

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