Is it okay to use apple cider vinegar or peroxide on outdoor plants to kill whiteflies?

Yes, both Apple cider vinegar and hydrogen peroxide can be used as natural remedies to help control whiteflies on outdoor plants. Apple cider vinegar acts as a repellent and can disrupt the pests' lifecycle, while hydrogen peroxide can help eliminate eggs and larvae. However, it's essential to test these solutions on a small area of the plant first to ensure they don't cause damage, and apply them during cooler parts of the day to minimize stress on the plants. Regular monitoring and combined methods may yield the best results in managing whitefly populations.