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Key Arthropods and Diseases

Affecting Apples

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Arthropods

Tarnished Plant Bug  Leafminer European Apple Sawfly Mites Plum Curculio Coddling Moth 

White Apple Leaf Hopper Aphids Apple Maggot Fly Borer

Tarnished Plant Bug (TPB)

Lygus lineolaris (Palisot de Beauvois)
 

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Leafminers (LM)

Apple Blotch Leafminer

Phyllonorycter crataegella (Clemens)

Spotted Tentiform Leafminer

Phyllonorycter blancardella (Fabricius)

The biology, phenology, and management of both leaf miner species are similar and are often collectively referred to as leafminers (LM).

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European Apple Sawfly (EAS)

Hoplocampa testudinea (Klug)

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Mites

European Red Mite (ERM)

Panonychus ulmi (Koch)

Two-spotted Spider Mite (TSSM)

Tetranychus urticae (Koch)

Sampling Date Action Threshold
May 15-May31 (sample middle-age fruit cluster leaves) 30% leaves with motile mites
June 1-June 15 (sample middle-aged fruit cluster leaves) 45% leaves with motile mites
June 16-June 30 (sample middle-aged fruit cluster leaves) 55% leaves with motile mites
July 1-July 15 (sample middle-aged leaves from anywhere) 65% leaves with motile mites
July 16-August 15 (sample middle-aged leaves from anywhere) 80% leaves with motile mites

1. Koehler,G.W. ed. 2000. Mite Pests. Pages 43-46 in: 2000-2001 New England Apple Pest Managment Guide.Cooperative Extension Universities of Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island and Vermont.

Toxicity to T. Pyri Chart1

Fungicide

Toxicity

Bayleton

low

benomyl

low

captan

low

mancozeb (before bloom)

moderate

mancozeb (after bloom)

high

metiram (before bloom) moderate
metiram (after bloom) high
Nova low
Procure low
Topsin M low
Ziram (after bloom) high

 

Bactericide

Toxicity

fixed copper

low

streptocycin

low

 

Insecticide

Toxicity

Agri-Mek

moderate

azinphosmethyl

low

Imidan

low

B.t.

low

carbaryl

low

Carzol high
Confirm low
dimethoate high
Lannate high
Lorsban moderate
Provado low
pyrethroids high
spinosad low
summer oil moderate
Thiodan low
Vydate high

 

Miticides

toxicity

Apollo

low

Kelthane

moderate

prebloom oil

low

Savey

low

Vendex

low

2. Breth, Nyrop, and Kovach. 1998. Acheiving biological control of European Red Mite in Northeast apples: An implementation guide for growers. New York State Publication. Number 215.

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Plum Curculio (PC)

Conotrachelus nenuphar(Herbst)

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Codling Moth (CM)

Cydia pomonella (L.)

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White Apple Leafhopper

Typhlocyba pomaria McAtee

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Aphids

Green Apple Aphid (GAA)

Aphis pomi De Geer

Spirea aphid

Aphis spiraecola Patch

Spirea aphids resemble GAA, the chief difference between them being that spirea activity may extend later into the summer, and the spirea aphid may have a somewhat different susceptibility to specific insecticides.

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Apple Maggot Fly (AMF)

Rhagoletis pomonella (Walsh)

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Borers

Dogwood borer

Synanthedon scitula (Harris)

Roundheaded apple tree borer

Saperda candida (Fabricus)

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