Evaluation of pheromone trapping for prediction of diamondback moth infestations in vegetable brassicas
AbstractThe use of pheromone traps was investigated as a monitoring tool to forewarn crop scouts of risk periods when diamondback moth (DBM; Plutella xylostella) larval numbers in crops are likely to increase to damaging levels We monitored traps at five brassica planting sites for 8 months and also counted numbers of DBM larvae on 50100 plants at each site Crops were scouted weekly and insecticide application decisions were made using the Crop amp; Food Research IPM programme Results showed that increases in moth trap catches predicted increases in larval infestations in three of four commercial crops in spring by 23 weeks and gave 2 weeks warning in four of five summer crops An epizootic of Zoophthora radicans caused a rapid decline in larval populations in mid to late January at all sites In these trials use of the IPM action thresholds led to a 75 reduction in insecticide use on vegetable brassica crops Overall pheromone traps were of limited value except in early spring because crops needed to be scouted regularly for other pests
How to Cite
Walker, G.P., A.R. Wallace, R. Bush, F.H. MacDonald, and D.M. Suckling. “Evaluation of Pheromone Trapping for Prediction of Diamondback Moth Infestations in Vegetable Brassicas”. New Zealand Plant Protection 56 (August 1, 2003): 180–184. Accessed October 4, 2022. https://journal.nzpps.org/index.php/nzpp/article/view/6039.