Trap Response and Fruit Damage by Obliquebanded Leafroller (Lepidoptera: Tortricidae) in Pheromone-Treated Apple Orchards in New York

Abstract

Pheromone disruptants were tested from 1989 to 1992 in western New York to determine effect on trap catch and potential use in the control of obliqueblmded leafroller. Clwristoneurct rosacearw (Harris), using polyethylene tube tie and controlled-release membrane dispensers in plots of 0.2-2.4 ha. Effectiveness of pheromone at different application rates and canopy locations was evaluated using synthetic pheromone-baited traps, molassesbaited traps, and by inspecting foliar terminals and fruit for leafroller damage. All pheromone treatments significantly reduced (by 56-97%) pheromone trap catches of male moths compared with catches in nontreated blocks. One application of a nahlral-blend formulation at 988 dispensers per hectare was better than 494/ha at dismpting trap catch of both Rights that occur during the year. However, mated female motlls were present in the orchard center as frequently as anywhere else in a pheromone-treated block, indicating either immigration from outside sources or resident females that were not prevented from mating by the pheromone. The membrane dispenser emitted the 3-component natural blend at proportions similar to those in wild female moths. Pheromone traps placed in the tops of trees in a pheromonetreated orchard always caught higher numbers of male moths than those in lower-or middlecanopy positions. Pheromonc treatment resulted in fruit damage similar to tlIat of a pheromone + insecticide treatment under low to moderate leah'oller population pressure (i.e., 3-5% fruit damage in untreated orchards); however, no control method was able to reduce damage to acceptable levels in all cases.

Developing Mating Disruption of Obliquebanded Leafroller (Lepidoptera: Tortricidae) in Washington State

“…Similarly, Agnello et al (1996) found no difference in the level of disruption by using dispensers loaded with either a 94:6 Z:Ell-14:0Ac blend or a 90:5:5 Z:Ell-14:0Ac: Zll-14:0H blend in New York.…”

“…The experimental use of sex pheromones to disrupt C. rosaceana adult communication was first reported by Reissig et al (1978) and more recently by Agnello et al (1996) and Lawson et al (1996) in New York.…”

Pest Phenology and Evaluation of Traps and Pheromone Lures for Monitoring Flight Activity of Obliquebanded Leafroller (Lepidoptera: Tortricidae) in Minnesota Apple Orchards

“…The delta trap is slightly more expensive ($4.68 per set) than wing trap ($3.35 per set), but this initial higher cost may be offset because the delta type is more durable and can be reused over multiple seasons. Pheromone mating disruption is increasingly being evaluated as a pest management strategy against leafrollers and other moth pests in North America (Deland et al 1994;Agnello et al 1996;Lawson et al 1996;Shorey and Gerber 1996;Fadamiro et al 1998Fadamiro et al , 1999Isaacs et al 1999). The western lure should provide better mating disruption of C. rosaceana in Minnesota, although the notion that higher mating disruption efÞcacy will result from the use of optimal blend needs to be investigated.…”

Comparative behavioral and EAG responses of female obliquebanded and redbanded leafroller moths (Lepidoptera: Tortricidae) to their sex pheromone components

“…However, the pheromone blends of these species are further differentiated by other minor components; these include (Z)-11-tetradecenol and (Z)-11-tetradecenal in the obliquebanded leafroller blend (El-Sayed et al, 2003) and dodecyl acetate in the redbanded leafroller blend . Control of redbanded leafroller by mating disruption using synthetic pheromones has been judged successful Novak et al, 1978;Novak & Roelofs, 1985;Cardé & Minks, 1995); however, results have been inconsistent for the obliquebanded leafroller Agnello et al, 1996;Lawson et al, 1996). Greater success has been recorded with a Western population of obliquebanded leafroller in British Columbia, Canada (Evenden et al, 1999a,b).…”