New Zealand Journal of Crop and Horticultural Science abstracts
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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