Fitness costs of resistance to Bacillus thuringiensis (Bt) crops occur in the absence of Bt toxins. when individuals with resistance alleles are less fit than individuals without resistance alleles. As costs of Bt resistance are common. refuges of non-Bt host plants can delay resistance not only by providing susceptible individuals to mate with resistant individuals. https://thegreensjunglebeautyshops.shop/product-category/diffuser/