Making Trissolcus releases
At this stage its unknown what release rates are needed to make a useful difference in crops. We do know that natural populations of Trissolcus can make a difference so releasing the wasps early in the life of the infestation is very likely to accelerate this process - as we have found with other biocontrol agents.
For short term crops like soybeans and tomatoes, regular releases starting a several weeks before the anticipated bug egg laying period is likely to have the most effect. If there are know sources of GVB nearby and accessable then wasps should be released there as well.
In this way early laid bug eggs can be parasitised and therefore slow the bug increase right at the start. Each female wasp can parasitise over 200 GVB eggs and develops from egg to adult in just 12-14 days. So if many bug eggs are being laid the wasp numbers can increase and spread markedly in the following weeks and have a major impact on GVB numbers.
Ordering and release method
Trissolcus wasps are sold by the 1,000 and are transported either as:
Emerged adults in various containers. We are experimenting. In this case wasps are allowed to escape from the container at numerous locations in/or around the crop.
As pupae developing in GVB eggs that are stuck on cards. The wasps start emerging intransit or shortly after arrival on farm. Cards are stapled to leaves with eggs facing away from direct sunlight.
Ordering and Cost
Trissolcus are sold in a program, 6 releases at 2-3 weeks apart, starting at first sight of bugs or earlier or regularly through year if bugs are typically an issue on farm.
$120 per 1,000 wasps plus postage and GST. If you are interested, contact us to discuss the suitability of Trissolcus releases for your farm situation.
Pdf's for download: