Beers, Elizabeth H.

Cockfield, Stephen D.

Johnson, D. G.

Zack, R. S.

Undetermined

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Abstracts ofthe 7? Annual Western OrchardPest &Disease Management ConferenceBiology/PhenologySusceptibility of apple cultivars to damage by Campylomma verbasciS. D. Cockfield and E. H. BeersWashington State University, Tree Fruit Research andExtensionCenter,Wenatchee, WAA£strzicTryzeffi$y\GT^dL nymphs were caged on king bloom flowers of seven apple cultivars.Golden Delicious^Delicious', 'Gala', 'Fuji', 'Cameo', and 'Granny Smith' showed somelamage" by pampylomma feeding. The symptoms were visible at petal fall. 'Braeburn' did notshow any damage symptoms under the experimental conditions. 'Gala', 'Granny Smith', 'Fuji',and 'Came/)' susceptibility was similar to that of 'Delicious'. All five were less susceptible than'Golden Delicious'.Biology/PhenologyEcology of western flower thrips in intra- and near-orchard habitatsS. D. Cockfield1, D. G. Johnson2, E. H. Beers1, and R. S. Zack2xTree Fruit Research and Extension Center, Washington State University, Wenatchee, WADept. of Entomology, Washington StateUniversity, Pullman, WAAbstract: Apple shoots harbored adult and immature thrips throughout the season until frost.Adult thrips appeared ondandelion flowers before apple flowers developed and first appeared onapple buds at delayed dormant. On the orchard floor, dandelion flowers, as well as other flowerssampled, harbored thrips until frost, sustaining a resident population in the orchard. Thrips fedand reproduced throughout the year in near-orchard habitats by switching hosts that produce newleaves and flowers in different seasons. Some plants, such as arrowleaf balsamroot,Balsamorhiza sagittata, bloomed in spring and then were dormant until the next year. Others,such as gray rabbitbrush, Chrysothamnus nauseosus, provided growing shoots throughout thespring and summer and flowers in the fall. The dominant climax woody species of the steppe, bigsagebrush, Artemisia tridentata, attracted great numbers of thrips when in bloom in the fall.Native grass species attracted some thrips when in flower, but in general samples contained veryfew thrips. All native grass species sampled were dormant in the summer and fall and could notserve as a continuous food source for immature thrips. The great majority of thrips onapple andotherhost plants inWashington appeared to be western flower thrips.15-17 January 2003, Hilton Hotel, Portland, OR <* Publ. by Washington State Univ., Pullman, WashingtonPage 2

Ecology of western flower thrips in intra- and near-orchard habitats

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Ecology of western flower thrips in intra- and near-orchard habitats

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