Pitcher GR. The new biorational pesticide for the suppression of vine weevil eggs and early stage instar larvae. It is approved through an Extension of Authorisation for Minor Use (EAMU) in containerised ornamental plants, both protected and outdoors. • Granular biorational insecticide • Part of an IPM solution to the problem of vine weevil • No resistance or re-entry periods • Low impact on non-target organisms How does it work? The active ingredient in Pitcher is garlic extract. Contained within the active ingredient are a unique range of Diallyl polysulfides (DAS). It is these compounds that provide the lethal biochemistry. When a vine weevil egg or early stage instar encounters Diallyl polysulfide (DAS) molecules they penetrate through the skin
Rate of passage through the cuticle is dependent on sulphur chain length
Once the DAS dissolve through the cuticle of the organism the lethal biochemistry starts
The action of DAS is initiated following a reaction with intracellular low molecular weight thiols (LMT's) and protein thiols in the organism
This leads to a cascade chain reaction within the organism which it can't regulate causing it to die due to overwhelming oxidative stress
The oxidative stress affects many cellular processes so it is very unlikely that resistance could ever evolve to the chemistry
How is it created?
When garlic is subject to mechanical stress, it releases two sulphur compounds which creates a range of DAS
O
"
S
NH2
Alliin CO2H
O
Allicin
"
S S
S-S
DASI S-S-S DAS3 S-S-S-S-S DAS5
DAS2
S - S - S- S
DAS4
S-S-S-S-S-S
04 | www.icl-protect.com/vineweevil or call +44 (0)1473 237 111
DAS6
Polysulphides
