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Pheromone Disruption of Oriental Fruit Moth in New York Peaches - 2000

Project Leaders: A. M. Agnello, W. H. Reissig, and D. I. Breth


Mating disruption was evaluated as a control tactic against oriental fruit moth in peaches using twist-ties, paraffin-based and sprayable pheromone formulations in commercial orchards. The treatments were:

1 — Isomate M-100 ties, applied 13—15 June at a rate of 120/acre

2 — 3M Sprayable Pheromone, applied by the growers beginning 17 June, at 2-week intervals at a rate of 1.7 oz/acre

3 — 3M Phase III Sprayable Pheromone, applied by the growers beginning 17 June, at 4-week intervals at a rate of 3.5 oz/acre

4 — Confuse-OFM paraffin, applied at the beginning of the 2nd (12-19 June) and 3rd (28 July) summer flights, at a rate of 30 g a.i./acre (3 squirts/tree from a forestry tree-marking paint gun).

Pheromone trap catches of OFM adult males in the disrupted plots were very low throughout the entire season, essentially remaining at or near zero despite considerable population pressure, as reflected in the Check plots. In only one case did some breakthrough in moth catches occur during the last month before harvest, when small numbers of OFM moths were caught in the Confuse and Isomate plots. In general, the growers did a good job of applying the sprayable formulations at the appropriate schedule timings, which is a particularly important aspect of using these products at their highest level of effectiveness.

Results of the pre-harvest fruit inspection showed fruit damage from OFM feeding and infestation to be quite low in all the treatments, surpassing 1% in very few of the plots. OFM injury was placed into one of two categories, with "stings" representing incidence of skin puncturing or nominal pitting progressing less than a few millimeters into the fruit, and the "internal" injury category reserved for actual tunnelling in the fruit flesh, with either the larva or its trail or frass evident when the fruit was cut. Few major differences among treatments were seen. The highest incidence of stings was found in one Isomate plot (2.6%), and of internal injury in a Confuse plot (3.6%). In summary, all treatments resulted in acceptable control, but timing of the respective products was a critical factor, and the importance of orchard weed management was emphasized as a means of preventing late-season cat-facing damage by immigrating hemipterous species.