Insect management tools
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Insect Management Tools. Ric Bessin Extension Entomologists University of Kentucky Lexington. Insecticide Changes. Premixes Cobalt, Hero New Chemistry Belt, Oberon, Radiant New formuations Force CS, Regent TS (?). Pest Management Changes. Higher input costs/moderate prices

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Insect management tools

Insect Management Tools

Ric Bessin

Extension Entomologists

University of Kentucky

Lexington


Insecticide changes

Insecticide Changes

  • Premixes

    • Cobalt, Hero

  • New Chemistry

    • Belt, Oberon,

    • Radiant

  • New formuations

    • Force CS, Regent TS (?)


Pest management changes

Pest Management Changes

  • Higher input costs/moderate prices

    • Seed costs as high as $350/unit

    • Dec 09 corn $3.72

    • Effect of Economic thresholds?

  • Preventive Controls

    • Bt crops

    • Seed treatments

    • More stacked Bts


Insect management tools

Bt Types for Corn Pests


Fall a rmyworm whorl feeding 1 9 scale leonard lsu agcenter 2007

Fall ArmywormWhorl Feeding, 1-9 ScaleLeonard, LSU AgCenter, 2007


Southwestern corn borer total tunnel length per 20 plants musser mississippi state university 2006

500

450

400

350

300

250

200

150

100

50

0

VT Pro

YieldGard

Herculex

Non Bt

Southwestern Corn BorerTotal Tunnel Length per 20 Plants Musser, Mississippi State University, 2006


Smartstax performance fayette co 2008

SmartStax PerformanceFayette Co. 2008


Future of bt corn

Future of Bt Corn

  • Resistance Management

    • Redundant Bt genes

      • SmartStax

    • New refuge strategies (??)

      • AcresMax

    • Reduced refuges

      • SmartStax, AcresMax

  • Broader-spectrum

    • More genes

      • YieldGard VT Pro


Insect management tools

What is the size your “B.t.” corn refuge?

  • 0 %

  • 1 to 19 %

  • 20 to 40 %

  • 41 to 60 %

  • More than 60 %

Early Bird Meetings

Turning Point Data

90 respondents

2008


Insect management tools

Are you worried about resistance to “B.t.” traits ?

  • Yes

  • No

Early Bird Meetings

Turning Point Data

101 respondents

2008


Insect management tools

HxXTRAMycogen 2T787, Urbana, IL, July 9, 2007: Mike Gray, Univ. of IL


Resistance management

Resistance Management

  • High-dose refuge strategy

    • Goal 500 : 1 ratio of susceptible to resistant

      • KEY ASSUMPTIONS

        • Random mating

        • High dose event at correct time/tissue in plant

        • Frequency of resistance initially low

  • No more than 80% Bt corn

    • Refuge within ½ mile for CB Bt’s

    • Refuge immediately adjacent for RW and CB/RW Bt lines


When is bt corn needed for ky

When is Bt Corn Needed (for KY)?

  • Bt CB –

    • Late planted corn

    • Corn planted after May 5

  • Bt RW –

    • Corn following corn >2 yrs

  • Bt CB + RW –

    • When both of the above is true


Bt corn summary

Bt-Corn Summary

New Bt corn traits will probably:

  • Not effect on yield in most cases

  • Better ECB & SWCB resistance management

  • May have reduced refuge (SmartStax)

  • Improved control of CEW & FAW

  • Potential mycotoxin reduction

  • Reduce corn earworm populations if widely

    adopted – benefit soybean and corn


Seed treatments

Seed Treatments

  • On virtually all corn seed

  • Providing insect control to help with stand establishment

  • Other benefits

    • Seedling vigor?


Environmental issues with seed treatments

Environmental Issues with Seed Treatments

  • Effect on Coleomegillamaculata, a lady beetle

  • Effect on Honey bees


Direction of seed treatments

Direction of Seed Treatments

  • Vigor enhancement

  • Nematode control

  • Resistance management – new classes of insecticides for seed treatments


Wireworm recommendations

Heavy Pressure

Consider RW seed treatments

Consider soil-applied insecticides (in furrow), rootworm rates

Light to Moderate

Consider seed treatments (secondary pest rates)

In-furrow soil-applied insecticides

Wireworm Recommendations

  • Don’t plant early into high risk sites


Insect management tools

Are you worried about resistance to seed applied Insecticides?

  • Yes

  • No

Early Bird Meetings

Turning Point Data

65 respondents

2008


Resistance management1

Resistance Management

  • Resistance likely to play a larger role in pest management in coming years.

  • Many of the most commonly used pesticide belong to only two chemical groups, pyrethroids and neonicotinyls.


Two most common groups

Pyrethroids

Ambush

Asana

Baythroid

Capture

Danitol

Decis

Mustang Max

Pounce

Proaxis

Renounce

Warrior

Neonicotinoids

Actara

Admire

Assail

Calypso

Clutch

Cruiser

Gaucho

Platinum

Poncho

Prescribe

Provado

Venom

Two most common groups


Is resistance appearing

Is Resistance Appearing?

  • Corn earworm (aka tomato fruitworm, soybean podworm, cotton bollworm) and pyrethroids?

  • Whiteflies – Bemisiatabaci Q biotype found in Kentucky.


Insecticide resistance rule 1

Insecticide Resistance: Rule 1

  • Do not treat successive generations of a pest with chemicals of the same mode of action (use sequences of products)

    • Do not tank mix products with same MOA

    • Know the chemical class / Mode of action (IRAC codes!!)

    • Know the life cycle of the pest


Soybean pests

Soybean Pests

  • Soybean aphid

  • Dectes stem borer

  • Red-shouldered stink bug

  • Megacoptacribraria

  • Western bean cutworm

  • Variant corn rootworm


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