Relative Abundance of the Spotted Tentiform Leafminer, Phyllonorycter blancardella (F.) , and the Apple Blotch Leafminer, P. crataegella (Clemens) (Lepidoptera: Gracillariidae) , on Sprayed and Unsprayed Apple Trees in Connecticut

Maier, C.T.

Annals of the Entomological Society of America 76(6): 992-995


ISSN/ISBN: 0013-8746
Accession: 006303451

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The relative abundance of P. blancardella (F.) and P. crataegella (Clemens) was examined on sprayed and unsprayed apple trees in Connecticut by identifying pupae collected from fallen leaves during the 3rd leafminer generation of 1980-1982. P. crataegella dominated at 8 of 9 sprayed sites. P. blancardella dominated at 7 of 8 unsprayed sites. The widespread occurrence of P. blancardella on apple trees and especially its dominance in 1 sprayed orchard contradicts published reports on its absence in Connecticut. Temporal and spatial variation in species composition at unsprayed sites is attributed partly to defoliation by the gypsy moth, Lymantria dispar (L.), and to the proximity of potential colonists in commercial orchards. Dominance of P. crataegella in most commercial orchards is probably related to its resistance to insecticides. The cause of P. blancardella dominance at most unsprayed sites is unknown.