I am sorry to hear your plants are flagging—that is an upsetting situation. I am not sure which recipe you used (we have a few on offer), but the National Gardening Association recommends a mixture of dishwashing liquid, such as Palmolive with lemon, and water—a sizeable squirt of soap to a gallon of water. The thing about any spray application is that timing is key. It needs to be done when the insect is at its most vulnerable stage—usually as larvae. The truth is, whitefly is nearly impossible to get rid of. It is a matter of preventative measures and population control, which this recipe should help with. The best method of control is beneficial insects. I realize this doesn’t help you at this point, but maybe it will of use at a later date (though I hope you will not have to deal with whitefly again!) Consider replacing your plants with non-host species. Again, very sorry to hear about your struggle.
I am sorry to hear your plants are flagging—that is an upsetting situation. I am not sure which recipe you used (we have a few on offer), but the National Gardening Association recommends a mixture of dishwashing liquid, such as Palmolive with lemon, and water—a sizeable squirt of soap to a gallon of water. The thing about any spray application is that timing is key. It needs to be done when the insect is at its most vulnerable stage—usually as larvae. The truth is, whitefly is nearly impossible to get rid of. It is a matter of preventative measures and population control, which this recipe should help with. The best method of control is beneficial insects. I realize this doesn’t help you at this point, but maybe it will of use at a later date (though I hope you will not have to deal with whitefly again!) Consider replacing your plants with non-host species. Again, very sorry to hear about your struggle.