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TRADE OR OTHER NAMES: Trade names for products containing lambda cyhalothrin include Charge, Excaliber, Grenade, Hallmark, Icon, Karate, Matador, OMS 0321, PP321, Saber, Samurai and Sentinel (62, 12).

REGULATORY STATUS: Lambda cyhalothrin is a Restricted Use Pesticide and so may be purchased and used only by certified applicators (62, 12). It is in EPA Toxicity Class II, and products containing it must bear the signal word WARNING (106).

INTRODUCTION: Lambda cyhalothrin is a synthetic pyrethroid insecticide and acaricide used to control a wide range of pests in a variety of applications. Pests controlled include aphids, Colorado beetles and butterfly larvae (12). Crops on which it may be applied include cotton, cereals, hops, ornamentals, potatoes, vegetables or others (12). It may also be used for structural pest management or in public health applications to control insects such as cockroaches, mosquitoes, ticks and flies which may act as disease vectors (12). Lambda cyhalothrin is available as an emulsifiable concentrate, wettable powder or ULV liquid (62, 12), and is commonly mixed with buprofezin, pirimicarb, dimethoate or tetramethrin (12). It is compatible with most other insecticides and fungicides (12). Unless otherwise stated, data presented herein refer to the technical product.




Breakdown of Chemical in Soil and Groundwater: Lambda cyhalothrin is moderately persistent in the soil environment. Reported field half-lives range from four to 12 weeks (107, 111, 112). Its field half-life is probably close to 30 days in most soils (112). It shows a high affinity for soil; the reported Koc is 180,000 (112). Lambda cyhalothrin is not expected to be appreciably mobile in most soils. There is little potential for groundwater contamination. Soils with high sand content or with very low organic matter content may tend to retain the compound to a lesser degree. In field studies of Karate, leaching of lambda cyhalothrin and its degradates from the soil were minimal (12, 107). Breakdown products formed in the soil environment are similar to those formed in mammalian systems, via the hydrolysis of the central ester bond and oxidation (12). Breakdown rates of both the technical product and Karate were similar under aerobic and anaerobic conditions (107, 111).

Breakdown of Chemical in Surface Water: Lambda cyhalothrin has extremely low water solubility and is tightly bound to soil, it is therefore not expected to be prevalent in surface waters. One possible source of infiltration into surface waters would be surface runoff. In this event, the compound would most probably remain bound to the solid particle and settle to the bottom.

Breakdown of Chemical in Vegetation: No data were available regarding the breakdown of lambda cyhalothrin in vegetation.


Physical Properties:

Exposure Guidelines:


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References for the information in this PIP can be found in Reference List Number 2

DISCLAIMER: The information in this profile does not in any way replace or supersede the information on the pesticide product label/ing or other regulatory requirements. Please refer to the pesticide product label/ing.