Pear psylla management arsenal gets bigger

Entomology and Trevor Nichols Research Complex

If you didn’t get the results you expected from your pear psylla management program last year you aren’t alone. Insecticide resistance is common in psylla throughout the pear-growing areas of the world. These insects spend most of their time within pear orchards and can be exposed to repeated applications of the same handful of insecticides unless attention is given to rotation among chemical classes. The good news is that growers now have many choices for control options, making it easier to avoid treating successive generations with the same material or with materials that have the same modes of action.

Table 1 contains products that are labeled for psylla control in pears in Michigan. Listed for each table entry are the mode of action (MOA) group number as assigned by the Insecticide Resistance Action Committee, common name, trade name and insecticide class.

Materials that share the same number have the same mode of action even if followed by a different letter. For example, carbaryl has an MOA classification of 1A and diazinon of 1B. The number 1 indicates that both materials share the same MOA, in this case they are both cholinesterase inhibitors. The letter after the number represents the chemical sub-group. Notice that the last six table entries have no MOA classification and can be applied whenever appropriate for that material. A sound resistance management program relies on treating successive generations of psylla with materials from different MOA groups. Read the label directions for complete information regarding application rates, timing, combination with adjuvants and precautionary statements regarding effects on natural enemies and bees. Check the 2008 Michigan Fruit Management Guide for information on the effectiveness of many of the control options. Call the MSUE Bulletin office at 517-353-6740 to order a copy.

Pear psylla
Pear psylla. Photo credit: J. Dykinga, USDA-ARS

Table 1.  Insecticides labeled for pear psylla control in Michigan

MOA Group1 Common name Trade name Insecticide class
1A
carbaryl
Sevin
carbamate
1B
azinphosmethyl
Azinphos-methyl,
organophosphate
1B
chlorpyrifos
Chlorpyrifos, Govern, Lorsban, Nufos, Warhawk, Whirlwind, Yuma
organophosphate
1B
diazinon
Diazinon
organophosphate
1B
dimethoate
Dimate
organophosphate
1B
methidathion
Supracide
organophosphate
2A
endosulfan
Endosulfan, Thionex
organochloride
3
deltamethrin
Battalion, Delta Gold, Decis
pyrethroid
3
esfenvalerate
Asana XL, Adjourn
pyrethroid
3
fenpropathrin
Danitol
pyrethroid
3
gamma-cyhalothrin
Proaxis
pyrethroid
3
lambdacyhalothrin
Silencer, Warrior
pyrethroid
3
permethrin
Ambush, Arctic, Pounce, Perm-Up, Permethrin
pyrethroid
3
zeta-cypermethrin
Mustang Max
pyrethroid
3
pyrethrins
Pyganic
pyrethrin
3, 27A
pyrethrin + piperonyl butoxide
Evergreen
pyrethrin
4A
acetamiprid
Assail
neonicotinoid
4A
clothianidin
Clutch
neonicotinoid
4A
imidacloprid
Couraze, Pasada, Provado, Impulse, Nuprid, Prey
neonicotinoid
4A
thiacloprid
Calypso
neonicotinoid
4A
thiamethoxam
Actara
neonicitinoid
5
spinetoram
Delegate
spinosyn
6
abamectin
Abacus, Abba, Agri-Mek, Epi-Mek, Reaper, Zoro
antibiotic
6
emamectin benzoate
Proclaim
avermectin
7C
pyriproxifen
Esteem
insect growth regulator
15
diflubenzuron
Dimilin
benzoylurea
16
buprofezin
Centaur
insect growth regulator
18B
azadirachtin
Aza-Direct, Ecozin, Neemix
botanical
21
fenpyroximate
FujiMite, Portal
phenoxypyrazole
21
pyridaben
Nexter
pyridazinone
 
sulfur
Golden-Dew, Kumulus DF, Micro Sulf, Microthiol Disperss, Sulfur-DF
 
 
horticultural oil
horticultural oil
 
 
calcium polysulfides
Rex Lime Sulfur Solution, Sulforix
 
 
kaolin clay
Surround
particle film
 
oil, paraffinic
Citrus oil, JMS Stylet-oil
 
 
potassium salts of fatty acids
M-Pede
 

1 mode of action classification

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