Ornamentals Insect and Mite Update – 2002-03

David J. Shetlar, Ph.D.The “BugDoc”

The Ohio State University, OARDC & OSU Extension

Columbus, OH

© October, 2002, D.J. Shetlar, all rights reserved

Ornamentals Insect and Mite Update – 2002-03

Information resources Pest activity review Life after FQPA??!!

Alternate insecticides

Alternate miticides

http://ohioline.osu.edu

Check OSU FactSheets - quarterly

Bulletin 504 – to be revised by February, 2003

http://webgarden.osu.edu/

BYGL OnLine – weekly update of Ohio nursery, landscape and turf pests

The P.E.S.T. Newsletter

available from:

Ohio Nursery & Landscape Association72 Dorchester SquareWesterville, OH 43081

614-899-1195800-825-5062

Come visit the BugDoc at:

http://bugs.osu.edu

Insect and Mite Activity in 2002

• Still suffering from borers because of plant stresses – mainly drought (Agrilis borers, flatheaded appletree borer, bark beetles, white pine weevil)

• Sucking pests – lace bugs, scales, spider mites

• Caterpillar/sawfly complex changes• New Pests Detected – Asian emerald ash

borer ?; viburnum leaf beetle in Ohio; Asian longhorn beetle ?

Photo: A. J. Storer

Photo: D. Roberts

Emerald Ash Borer

Photos: Cornell University

Viburnum Leaf Beetle

Borers Continue – Agrilis species

Bronze birch borer

Borers Continue – Agrilis species

Honeylocust borer

Twolined chestnut borer

Borers Continue – Flatheaded Appletree Borer

Borers Continue –Clearwing borers

Rhododendron borer

Borers Continue – Bark Beetles – mainly conifers

Asian Ambrosia Beetle – “toothpicks”

Photos: bugwood

Borers Continue – White Pine Weevil – white pine & SPRUCE

Borer Insecticides

Traditional• Dursban• Lindane• DiSyston (disulfoton)• Cygon (dimethoate)• Bidrin injection• Orthene injection

Alternatives• Tempo, Talstar,

Deltagard, Scimitar, Astro

• Merit injection (beetles only!)

• ???• ???

X

X

??

X

X

Borer Control Approaches

Cultural –Use plants that are not prone to borer attack!Plant health care – plants in good growing

conditions can usually repel borer attacks.

Avoid Plant Damage – damaged plants are prone to attack.

Biological –Usually not effective because they attack

after infestation.

Caterpillars – The Gypsy Moth

Caterpillars – Fall Webworm, Mimosa Webworm, Bagworm

Caterpillar Insecticides

Traditional• Dursban• Sevin• Orthene• Malathion

Alternatives• Tempo, Talstar,

Deltagard, Scimitar, Astro

• Conserve• Bt• Soaps or Oils

X

?

X

Cool-Season Pests – Spruce Spider Mite – inactive most of summer!

MiticidesTraditional• Kelthane• Morestan• Cygon• Orthene ?

Alternatives• Avid• Hexygon (eggs & larvae

only, spider mites only)• Floramite (spider mites

only)• Sanmite (spider mites

only)• Conserve• Pyrethroids??• Soaps or Oils

X

X

??

Pine tortoise scale mature females on stem.

Pine needle scale second instar nymphs and male “pupae” on needles.

Pine needle scale females. Note pinkish eggs at end of scale test (shell) and a settled crawler at upper left.

Group of pine needle scale settled crawlers (tan) and a couple of fresh crawlers (pinkish) in color.

Scale Control (crawlers)

Traditional• Diazinon• Dursban• Sevin• Orthene• Malathion• Cygon• DiSyston (disulfoton)

Alternatives• Tempo, Talstar,

Deltagard, Scimitar, Astro

• Merit (soft scales)• Meridian (Flagship)?• Soaps & Oils

X

X

??

?

X

X

Black Vine Weevil ManagementWhat’s Lost?

Ficam (Turcam)Orthene is on the way out!

What are the Alternatives?

Merit! (home owner product available, apply to soil, NOT mulch, not for adults!)

Pyrethroids for Adults

DiSyston (disulfoton) (home owner products available, BVW not named on label, apply to soil!)