Spiromesifen

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Chemical Identification | General Product Information | Physical & Safety Data

Chemical Identification

Common Name

Spiromesifen

中文通用名

螺甲螨酯

IUPAC

3-mesityl-2-oxo-1-oxaspiro[4.4]non-3-en-4-yl 3,3-dimethylbutyrate

CAS

2-oxo-3-(2,4,6-trimethylphenyl)-1-oxaspiro[4.4]non-3-en-4-yl 3,3-dimethylbutanoate

CAS No.

283594-90-1

Molecular Formula

C₂₃H₃₀O₄

Molecular Structure

General Product Information

Category

Acaricides / Miticides > Tetronic acid acaricides

Activity

Insecticide

Spiromesifen controls spider mites at all stages of development though the adult females and teleiochrysalis stage (the quiescent phase prior to adult moult) are significantly less susceptible. There is a slight delay in onset of activity but pest control is faster than benzoyl phenyl ureas.

Spiromesifen is highly effective against whiteflies. Although its mode of action is unclear it seems to interfere with development and lipogenesis. The product is particularly active against juvenile stages. The ovicidal effect in mites is strong.

Laboratory studies showed no cross resistance with existing acaricides such as fenpyroximate, pyridaben, abamectin, clofentazine, hexythiazox, dicofol and organophosphates. Field trials confirmed the activity against T urticae on eggplants with spiromesifen performing at the level of the commercial reference, avermectin.

In field trials, spiromesifen controls the juvenile stages (instars 1-3) of sweet potato whiteflies (Bemisia tabaci, B argentifolii). Foliar applications cause loss of fecundity in adult insects. The US National Potato Council identified spiromesifen as a significant potential product in the Pacific Northwest where mite control is a major issue for growers and propargite is the only currently (2004) available miticide. Washington and Oregon have submitted requests for Section 18 approvals for bifenazate, but spiromesifen is the preferred option on the basis of efficacy.

Trials conducted worldwide under varying climatic conditions showed excellent residual control of different biotypes of Bemisia tabaciiin cotton. In early season cotton, spiromesifen is comparable to Zephyr and superior to Savey and Comite.

Trials in spring melons in Arizona showed that Oberon, applied alone or in combination with Admire (imidacloprid), provided good residual control of whitefly, comparable to Courier (thiamethoxam) or Applaud (buprofezin). The results indicate Oberon could provide melon growers with an alternative to Admire or a rotational partner for Courier or Capture.

Greenhouse studies showed that spiromesifen controls whitefly strains resistant to organophosphates, carbamates, pyrethroids, pyriproxyfen and endosulfan. Certain Spanish (Almeria) Q strains that are highly resistant to neonicotinoid products were found to be susceptible to spiromesifen. Both laboratory and field studies reveal that the product is safe on beneficial organisms suitable for IPM (Integrated Pest Management) practices.

CropUse

CropUses:
apples, cotton, brassicas, cucurbits, fruiting vegetables, leafy vegetables, maize, melons, ornamentals, peppers, pome fruit, potatoes, strawberries, tea, tomatoes, tuberous vegetables

Judo	480 g ai / Litre
Oberon 4SC	480 g ai / Litre
Forbid 4F	480 g ai / Litre

Premix

Type	AI concⁿ
Suspension concentrate (SC)	24% (w/w)
Suspension concentrate (SC)	48% (w/w)

Physical & Safety Data

Toxicology

Acute oral (rat)

LD₅₀ 2500 mg/kg

Environmental Profile

WATER SOLUBILITY: 0.13 mg/ml

Acute bird studies	LD₅₀ > 2000 mg/kg
Bee _[oral]	LD₅₀ >790 μg/bee
Earthworms	LC₅₀ >1000 mg/kg dry weight soil
Bee _[contact]	LD₅₀ >200 μg/bee