Chemical compatibility of N. fallacis

Compatibility of the Predatory Mite Neoseiulus fallacis with
Pesticides Registered for Use in Ornamental Nurseries

Department of Entomology, Oregon State University

Cordley Hall, Corvallis OR 97331

Office: (541) 737-4733 Fax: (541) 737-3643

Biological control agents are notoriously sensitive to pesticides. The use of broad spectrum pesticides in nursery systems limits the role of the predatory mite Neoseiulus fallacis as a biological control agent of spider mites. To aid growers in their selection of pesticides we have reviewed the SELCTV database and recent literature to develop toxicity ratings for some insecticides, miticdes, herbicides and fungicides to N. fallacis. In the tables below, two strains of N. fallacis are reported: R= resistant, S= susceptible. These strains refer to resistance of N. fallacis to organophosphate insecticides. When ordering predatory mites one should ask the supplier if they are providing a resistant or susceptible strain of the predatory mite. The last column includes a summary toxicity rating, which is an average of all the toxicity reports for each active ingredient that was used in our test. These ratings are: 1= 0% effect (i.e. mortality); 2= <10%; 3= 10-30%; 4= 31-90%; 5= >90%. The use of pesticides with low toxicity ratings may improve the sustainability of N. fallacis as a biological control agent in nursery systems.

Toxicity ratings for insecticide and miticide active ingredients registered
for use in ornamental nurseries of Oregon.

Insecticides and Miticides				SELCTV^bData Base	Current Tests^e
Active Ingredient	Trade Name	Chemical Class	Strain^a	Ave. Tox. Rating^c (N)	Ave. Tox. Rating (N)	Summary^fTox. Rating
abamectin	Avid	acyclic lactone	R	4.0 (1)		4.0
acephate	Orthene	organophosphate	R	1.0 (1)	4.0 (1)	2.5
			S	5.0 (1)		5.0
azinphos-methyl	Guthion	organophosphate	R	2.6 (14)	3.0 (1)	2.7
			S	3.1 (27)		3.1
bifenthrin	Talstar	pyrethroid	R		5.0 (1)	5.0
carbaryl	Sevin	carbamate	R	4.8 (5)		4.8
			S	4.3 (11)		4.3
carbofuran	Furadan	carbamate	R	5.0 (2)	5.0 (1)	5.0
			S	5.0 (1)		5.0
chlorpyrifos	Dursban (Lorsban)	organophosphate	R		5.0 (2)	5.0
			S	5.0 (1)	5.0 (1)	5.0
chlorotoluron	Alert		R		5.0 (1)	5.0
diazinon	Diazinon	organophosphate	R	3.0 (18)	5.0 (1)	3.2
			S	4.0 (8)		4.0
dicofol	Kelthane	organotin	R		5.0 (2)	5.0
			S	3.0 (9)	5.0 (1)	3.4
dimethoate	Dimethoate	organophosphate	R	4.0 (2)		4.0
dimethoate	Dimethoate	organophosphate	S	4.7 (6)		4.7
endosulfan	Endosulfan (Thiodan)	organosulfur	R		4.0 (2)	4.0
			S	2.9 (9)	5.0 (1)	3.4
fenbutatin oxide	Vendex	organotin	R		2.0 (1)	2.0
hexythiazox	Hexygon	organosulfur	R		2.0 (1)	2.0
lindane	Lindane	organochlorine	S	2.0 (1)		2.0
oxydemeton-methyl	Metasystox-R	organophosphate	R		5.0 (1)	5.0
oxythioquinox	Joust (Morestan	organosulfur	S	3.7 (3)		3.6
Mineral oil			R	4.0 (2)		4.0
permethrin	Ambush (Pounce)	pyrethroid	R	4.5 (6)		4.5
			S	4.5 (11)		4.5
phosmet	Imidan		R	3.0 (3)		3.0
			S	2.6 (15)		2.6
propargite	Omite (Ornamite)	organosulfur	R	1.0 (3)	1.0 (1)	1.0
			S	1.8 (4)		1.8
spinosad	Conserve	fungal metabolite	R		2.0 (1)	2.0

^a: Strain of N. fallacis that is either R= resistant, S= susceptible to organophosphate insecticides.
^b: Database containing toxicity data of agrochemicals to beneficial organisms.
^c: Average toxicity value calculated from reports (N) in SELCTV, see text for rating system.
^d. Standard Deviation.
^e: Toxicity data gathered from recent literature (post-1986).
^f: Average of all selective and current toxicity ratings.

Toxicity of fungicide active ingrediants to the biological control agent N. fallacis.

Fungicides			SELCTV Data Base^b	Current^e Tests
Active Ingredient	Trade Name	Strain^a	Ave. Tox. Rating^c (N)	Ave. Tox. Rating (N)	Summary^f Tox. Rating
benomyl	Benlate	S	4.2 (9)		4.2
		R	2.0 (4)	2.0 (1)	2.0
captan	Captan	S	3.0 (4)		3.0
		R	1.0 (1)	2.0 (1)	1.5
dichlone	Diclone 50	S	2.3 (3)		2.3
dithianon	Dithionan	S	1.0 (2)		1.0
dodine	Cyprex	S	2.3 (6)		2.3
fosetyl-aluminum	Aliette	R		2.0 (1)	2.0
glyodin	Glyodin	S	3.5 (2)		3.5
iprodione	Rovral	R		2.0 (1)	2.0
metalaxyl	Ridimil	R		5.0 (1)	5.0
metiram	Polyram	S	1.3 (3)		1.3
myclobutanil	Rally	R		2.0 (1)	2.0
propiconazole	Tilt	R		1.0 (1)	1.0
sulfur	Kolo-100/Wetable S	S	3.0 (1)		3.0
sulfut	Thiolux	R		1.0 (1)	1.0
thiram	Thiram	S	2.5 (2)	2.0 (1)	2.3

^a: R= resistant, S= susceptible to organophosphate insecticides.
^b: Database containing toxicity data of agrochemicals to beneficial organisms.
^c: Average toxicity value calculated from reports (N) in SELCTV, see text for rating system.
^d. Standard Deviation.
^e: Toxicity data gathered from recent literature (post-1986).
^f: Average of all selective and current toxicity ratings.

Toxicity of herbicide active ingrediants to N. fallacis.

Herbicides			SELCTV Data Base^b	Current^e Tests
Active Ingredient	Trade Name	Strain^a	Ave. Tox. Rating^c (N)	Ave. Tox. Rating (N)	Summary^f Tox. Rating
bentazon	Basagran	R		1.0 (1)	1.0
bromoxtnil	Buctril	R		5.0 (1)	5.0
clomazone	Command	R		2.0 (1)	2.0
dalapon	Dalapon	S	3.0 (1)		3.0
diuron	Karmex/Topsite	R	3.0 (1)	0.0 (1)	1.5
fluazipop-p-butyl	Fulislade	R		3.0 (1)	3.0
gramaxone	Paraquat/Cyclone	R		5.0 (1)	5.0
napropamide	Devrinol	R		2.0 (1)	2.0
oxyfluoren	Goal	R		3.5 (2)	3.5
pendimethylin	Prowl	R		5.0 (1)	5.0
pyridate	Tough	R		3.0 (1)	3.0
quizalofop-p-ethyl	Assure	R		3.0(1)	3.0
sethoxydin	Poast	R		3.0 (2)	3.0
simazine	Simizine	R	2.0(1)	2.0 (1)	2.0
sufentrazone	Authority	R		2.0 (1)	2.0
terbacil	Sinbar	R		2.5 (2)	2.5

^a: R= resistant, S= susceptible to organophosphate insecticides.
^b: Database containing toxicity data of agrochemicals to beneficial organisms.
^c: Average toxicity value calculated from reports (N) in SELCTV, see text for rating system.
^d. Standard Deviation.
^e: Toxicity data gathered from recent literature (post-1986).
^f: Average of all selective and current toxicity ratings.

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Last Updated September 25, 1999.

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