New Zealand flower thrips and their impact on nectarine fruit diseases


  • G.F. McLaren
  • J.A. Fraser
  • P.A. Alspach



Insecticides fungicides and a bactericide were applied in spring 2001 and 2002 to nectarine trees to determine the impact of thrips (mainly New Zealand flower thrips Thrips obscuratus) on summerfruit pathogens Thrips numbers were assessed over 7 weeks from the beginning of flowering The insecticide programme increased the proportion of fruit meeting export standards for thrips damage but did not influence the level of either brown rot caused by Monilinia fructicola or the bacterial diseases bacterial blast (Pseudomonas syringae) and bacterial spot (Xanthomonas arboricola pv pruni) The fungicide programme reduced the level of brown rot Cumulative thrips counts were positively correlated with levels of brown rot infection on the fruit at harvest time in 2001/02 (P002) and 2002/03 (P009) and bacterial disease symptoms in 2001/ 02 (P003) It was concluded that New Zealand flower thrips could increase levels of disease in nectarines but the value of treating with insecticides was not clear




How to Cite

McLaren, G.F., J.A. Fraser, and P.A. Alspach. “New Zealand Flower Thrips and Their Impact on Nectarine Fruit Diseases”. New Zealand Plant Protection 56 (August 1, 2003): 157–163. Accessed August 11, 2022.




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