Taking an environmentally sensitive approach to pest management


Integrated Pest & Crop Management



AUTHOR

Wayne C. Bailey
University of Missouri
Division of Plant Sciences
(573) 882-2838
baileyw@missouri.edu

Grasshopper Numbers Rapidly Increasing in Many Areas of Missouri

Wayne C. Bailey
University of Missouri
(573) 882-2838
baileyw@missouri.edu

Published: June 29, 2012

Numerous grasshoppers can be found in pastures, field borders, and in crop fields in most areas of Missouri. As drought conditions cause the drying of grasses in pastures and field borders, small and medium sized hoppers are moving to field crops to feed. Dry conditions occurring across most of Missouri favor grasshopper survival by reducing the threat from various viral pathogens that reduce grasshopper numbers in most years. The economic thresholds for grasshoppers vary depending on the commodity or non-cropland area requiring insecticide applications for effective grasshopper management. In Missouri, there are approximately 100 species of grasshoppers commonly found, although only 5-7 species are common in field crops. Most entomologist believe that smaller grasshoppers (small nymphs) are more easily controlled with insecticides than larger nymphs or adult hoppers. As with most insects, the larger the hoppers grow, the more foliage and other plant materials they consume. Damage from both nymph and adult grasshoppers is often seen as very ragged feeding wounds located on leaf edges. In severe situations, high numbers of grasshoppers can consume large amounts of vegetation and cause substantial loss of grain and forage yields. Economic threshold information and labeled insecticides are listed with each of the following commodity tables.

SITE: Alfalfa
GRASSHOPPERS - 2012
Comments: Control grasshoppers when they are small by applying spot treatments to hatching sites in non-cropland areas. Treatment in these areas is justified when grasshopper numbers reach or exceed 15 grasshoppers per square yard.
Common name Trade name Rate of Formulated Material/Acre Placement/Comments
beta-cyhalothrin *Baythroid XL 2.0 to 2.8 fl oz broadcast
chlorpyrifos + gamma-cyhalothrin *Cobalt 7 to 13 fl oz  
dimethoate Dimethoate see product label  
chlorpyrifos *Lorsban Advanced 1/2 to 1 pt  
gamma-cyhalothrin *Proaxis 2.56 to 3.84 fl oz  
zeta-cypermethrin *Mustang Max 2.8 to 4.0 fl oz  
carbaryl Sevin XLR Plus 1 to 3 pt  
zeta-cypermethrin + chlorpyrifos *Stallion 9.25 to 11.75 fl oz  
cyfluthrin *Tombstone 2.8 to 4.0 fl oz  
lambda-cyhalothrin + chlorantraniliprole *Voliam xpress 6.0 to 9.0 fl oz  
lambda-cyhalothrin *Warrior II 1.28 fl oz  
*Designates a restricted-use pesticide. Use is restricted to certified applicators only. Regardless of the formulation selected, read the label to determine appropriated insecticide rates, directions, precautions, and restrictions.

GRASSHOPPER Complex 2012 - SITE: Corn
Comments: Control grasshoppers when they are small by applying spot treatments to hatching sites in field borders and grass waterways. Treatment is justified in corn field when 7 or more grasshoppers per square yard are present and filiage is being severely damaged. After pollen shed, control may be necessary if grasshoppers are damaging foliage above ear zone. Dimethoate should not be applied to corn during pollen-shed.
Common name Trade name Rate of Formulated Material/Acre Placement REI Hours Pre-Harvest Interval Days
esfenvalerate *Asana XL 5.8 to 9.6 fl oz foliage 12 21 (grain)
cyfluthrin *Baythroid XL 1.6 to 2.8 fl oz foliage 12 21 (grain or fodder)
0 (green forage)
bifenthrin *Brigade 2EC 2.1 to 6.4 fl oz foliage 12 30 (grain, fodder,
graze)
chlorpyrifos + gamma-cyhalothrin *Cobalt 7 to 13 fl oz foliage 24 21 (grain or ears)
14 (graze or
silage haravest)
deltamethrin *Delta Gold 1.5EC 1.0 to 1.5 fl oz foliage 12 21 (grain, fodder)
12 (cut forage
or graze)
dimethoate Dimethoate 4E 1 pt foliage 48 28 (grain) 14 (forage)
zeta-cypermethrin + bifenthrin *Hero 2.6 to 6.1 fl oz foliage 12 30 (grain, stover,
graze)
60 (forage)
chlorpyrifos *Lorsban Advanced 1/2 to 1 pt foliage 24 21 (grain, ears,
forage, fodder)
chlorpyrifos *Lorsban 4E 1/2 to 1 pt foliage 24 21 (grain, ears,
forage, fodder)
zeta-cypermethrin *Mustang Max 2.72 to 4.0 fl oz foliage 12 30 (grain, stover)
60 (forage)
chlorpyrifos *Nufos 4E 1/2 to 1 pt foliage 24 21 (grain or ears)
microencapsulated
methyl parathion
*Penncap-M 2 to 3 pt foliage 48 12 (grain, forage,
graze)
zeta-cypermethrin + chlorpyrifos *Stallion 9.25 to 11.75 fl oz foliage 24 30 (grain, stover,
graze)
60 (forage)
cyfluthrin *Tombstone Helios 2.1 to 2.8 fl oz foliage 12 21 (grain or fodder),
0 (forage)
lambda-cyhalothrinn +
chlorantraniliprole
*Voliam xpress 6.0 to 9.0 fl oz foliage 24 1(forage) 7 (hay)
lambda-cyhalothrin *Warrior II 1.28 to 1.92 fl oz foliage 24 21 (grain),
1 (graze, forage)
21 (treated feed
or fodder)
*Designates a restricted-use pesticide. Use restricted to certified applicators only. Read the label and follow all insecticide rate information, directions, precautions, and restrictions.

GRASSHOPPER spp. 2012 - SITE: Sorghum
Comments: Control grasshoppers when they are small by applying spot treatments to hatching sites in field borders and grass waterways. Treatment in field is justified when 7 or more grasshoppers per square yard are present.
Common name Trade name Rate of Formulated Material/Acre Placement REI Hours Pre-Harvest Interval Days
cyfluthrin *Baythroid XL 2 to 2.8 fl oz grain head, foliage 12 14 (grain or graze)
chlorpyrifos +
gamma- cyhalothrin
*Cobalt 7 to 13 fl oz grain head, foliage 24 30 (grain, forage,
fodder, hay, or silage)
gamma-cyfluthrin *Declare 1.02 to 1.54 fl oz grain head, foliage 24 30 (grain)
deltamethrin *Delta Gold 1.5EC 1 to 1.5 fl oz grain head, foliage 12 14 (grain, cut or
graze forage)
dimethoate Dimethoate 4E 1/2 to 1 pt grain head, foliage 48 28 (grain) 14 (forage)
chlorpyrifos *Lorsban Advanced 1/2 to 1 pt grain head, foliage 24 30 (grain, forage,
fodder, hay, or silage)
chlorpyrifos *Lorsban 4E 1/2 to 1 pt grain head, foliage 24 30 (grain, forage,
fodder, hay, or silage)
zeta-cypermethrin *Mustang Max 3.2 to 4.0 fl oz grain head, foliage 12 30 (grain, stover)
45 (forage)
chlorpyrifos *Nufos 4E 1/2 to 1 pt grain head, foliage 24 30 (grain, forage,
fodder, hay, or silage)
zeta-cypermethrin + chlorpyrifos- *Stallion 9.25 to 11.75 fl oz grain head, foliage 24 30(grain, stover)
45(forage)
cyfluthrin *Tombstone Helios 2 to2.8 fl oz grain head, foliage 12 14 (harvest or
graze forage)
lambda-cyhalothrin *Warrior II 1.28 to 1.92 fl oz grain head, foliage 24 30 (grain), 7 (graze)
30 (straw fed
to livestock)
*Designates a restricted-use pesticide. Use restricted to certified applicators only. Read the label and follow all insecticide rate information, directions, precautions, and restrictions.

GRASSHOPPER Complex 2012 - SITE: Soybean
Comments: Treat when defoliation reaches 30% before bloom, 20% bloom to pod fill, or when 5% to 10% of pods are damaged and hoppers are present. Treat when grasshoppers are small for optimal control.
Common name Trade name Rate of Formulated Material/Acre Placement REI Hours Pre-Harvest Interval Days
esfenvalerate *Asana XL 5.8 to 9.6 fl oz foliage 12 21 (grain)
Do not graze or feed livestock
cyfluthrin *Baythroid XL 2.0 to 2.8 fl oz foliage 12 45 (grain, feeding dry
vines) 15 (green forage)
bifenthrin *Brigade 2EC 2.1 to 6.4 fl oz foliage 12 18 (grain)
chlorpyrifos +
gamma-cyhalothrin
*Cobalt 7 to 13 fl oz foliage 24 30 (grain)
Do not graze or feed livestock
dimethoate Dimethoate 4EC 1 pt foliage 48 21 (grain)
lambda-cyhalothrin
+ thiamethoxam
*Endigo ZC 3.5 to 4.5 fl oz foliage 24 30 (grain)
Do not graze or feed livestock
zeta-cypermethrin + *Hero 2.6 to 6.1 fl oz foliage 12 21 (grain)
Do not graze or feed livestock
Imidacloprid +
cyfluthrin
*Leverage 2.7 3.8 fl oz foliage 12 45 (grain, feeding dry
vines) 15 (green forage)
chlorpyrifos *Lorsban Advanced 1 to 2 pt foliage 24 28 (grain)
Do not graze or feed livestock
zeta-cypermethrin *Mustang Max 3.2 to 4.0 fl oz foliage 12 21 (grain)
Do not graze or feed livestock
chlorpyrifos *Nufos 4E 1/2 to 1 pt foliage 24 28 (grain)
Do not graze or feed livestock
acephate Orthene 97 1/4 to 1/2 lb foliage 24 14 (grain)
Do not graze or feed livestock
microencapsulated
methyl parathion
*Penncap-M 2 to 3 pt foliage 96 20 (grain)
zeta-cypermethrin
+ chlorpyrifos
*Stallion 5.0 to 11.75 fl oz foliage 24 28 (harvest)
Do not graze or feed livestock
cyfluthrin *Tombstone Helios 2.0 to 2.8 fl oz foliage 12 45 (grain, feeding dry
vines) 15 (green forage)
lambda-cyhalothrin *Warrior II with Zeon 1.60 to 1.92 fl oz foliage 24 30 (grain)
Do not graze or feed livestock
*Designates a restricted-use pesticide. Use restricted to certified applicators only. Read the label and follow all insecticide rate information, directions, precautions, and restrictions.

GRASSHOPPERS (numerous species) 2012 - SITE: Wheat
Comments: Treat when 8 or more adults per square yard are present within crop. Barrier treatments in border areas may be required to prevent migration into the crop if more than 20 adults per square yard are present in field margins.
Common name Trade name Rate of Formulated Material/Acre Placement REI Hours Pre-Harvest Interval Days
cyfluthrin *Baythroid XL 1.8 to 2.4 fl oz foliage 12 30 (grain) 3 (grazing or forage)
dimethoate Dimethoate 4EC 3/4 pt foliage 48 35 (grain) 14 (grazing)
zeta-cypermethrin *Mustang Max 3.2 to 4.0 fl oz foliage 12 14 (grain. forage, hay)
microencapsulated
methyl parathion
*Penncap-M 2 to 3 pt foliage 48 15 (harvest or graze)
zeta-cypermethrin + chlorpyrifos *Stallion 5.0 to 11.75 fl oz foliage 24 14(forage, hay) 28(grain, straw)
cyfluthrin *Tombstone Helios 1.8 to 2.4 fl oz foliage   3(forage), 30(grain)
lambda-cyhalothrin *Warrior II with Zeon 1.28 to 1.92 fl oz foliage 24 30 (grain or straw)
7 (hay or forage)
Seed Treatments          
*Designates a restricted-use pesticide. Use restricted to certified applicators only. Read the label and follow all insecticide rate information, directions, precautions, and restrictions.

SITE: Non-Cropland Areas - GRASSHOPPERS - 2012
Comments: Control grasshoppers when they are small by applying spot treatments to hatching sites in non-cropland areas. Treatment in these areas is justified when grasshopper numbers reach or exceed 15 grasshoppers per square yard.
Common name Trade name Rate of Formulated Material/Acre Placement/Comments
esfenvalerate *Asana XL 2.9 to 5.8 fl oz Broadcast
zeta-cypermethrin *Mustang Max 3.2 to 4.0 fl oz Broadcast**
acephate Orthene 75S 2 oz to 2 2/3 oz of soluable powder Broadcast
carbaryl Sevin XLR Plus 1 to 3 pt Broadcast
lambda-cyhalothrin *Warrior II 1.28 fl oz Broadcast
*Designates a restricted-use pesticide. Use is restricted to certified applicators only.
**Foliage must not be used for forage or grazed for all products listed except for Mustang Max which has a 0-day pre grazing interval. Regardless of the formulation selected, read the label to determine appropriated insecticide rates, directions, precautions, and restrictions.

SITE: Grass Pastures - GRASSHOPPERS - 2012
Comments: Control grasshoppers when they are small by applying spot treatments to hatching sites or in grass pastures. Treatment in these areas is justified when grasshopper numbers reach or exceed 7 grasshoppers per square yard.
Common name Trade name Rate of Formulated Material/Acre Placement Pre-Harvest Interval Days
zeta-cypermethrin *Mustang Max 3.2 to 4.0 fl oz Broadcast 0(forage, hay), 17(straw)
carbaryl Sevin XLR Plus 1 to 4 pt Broadcast 14(harvest or grazing)
lambda-cyhalothrin +
chlorantraniliprole
*Voliam xpress 6.0 to 9.0 fl oz Broadcast 0(harvest or graze)
lambda-cyhalothrin *Warrior II 1.28 to 1.92 fl oz Broadcast 0(grazing or forage) 7(hay)
*Designates a restricted-use pesticide. Use is restricted to certified applicators only. Regardless of the formulation selected, read the label to determine appropriated insecticide rates, directions, precautions, and restrictions.

   About IPM     Contact Us    Subscribe     Unsubcribe

Copyright © 2018 — Curators of the University of Missouri. All rights reserved. DMCA and other copyright information. An equal opportunity/access/affirmative action/pro-disabled and veteran employer.

Printed from: https://ipm.missouri.edu
E-mail: IPM@missouri.edu

REVISED: July 2, 2012