I'm using Thymol to try to control Stink Bugs this year. I wear disposable nitrile gloves to crush as many adults as possible and use the Thymol spray (40ml/per litre of water) to repel and kill the nymphs and eggs. Claud
(The Thymol is hard to find at a reasonable price.)
My sourse:
https://www.amazon.com/dp/B00RY7CSH0/
Thyme (Thymus): Thymol
Thyme has been found to be lethal to eggs, nymphs, and adult stink bugs. It is both a contact poison to them and a fumigant and
repellent. The trick is the concentration. It takes a great deal of thymol to kill an adult green stink bug (Nezara) versus a nymph, so
it is best to spray for nymphs for efficiency's sake but even better to use it as a repellent. The rates for the essential oil use for repellency is 20 ml/L for nymphs and 40 ml/L for adults, killing nymphs is 22 ml/L but killing adults takes an excessive 180 ml/L (Gonzalez et al., 2010). Alternatively, a couple handfuls of thyme fresh from the garden could be run through a blender with water strained and sprayed using a spray bottle.
The above is from:
A program of the National Center for Appropriate Technology • 1-800-346-9140 • www.attra.ncat.org
Produced by the National Center for Appropriate Technology
www.ncat.org • 1-800-275-6228 (1-800-ASK-NCAT)
(Parent organization to the ATTRA Project, www.attra.ncat.org)
Stink Bugs —Botanical Control Formulations
By Justin Duncan, NCAT Agriculture Specialist • Published Sept. 2016 ©NCAT
IP528 • Slot 554
This material is based upon work that is supported by the National Institute of Food and Agriculture, U.S. Department of Agriculture, under award number 2013-51106-20970.
