Temperatures dropped, and the combination of wet and cold caused the death of an estimated 500 million butterflies, which lay in piles up to three feet [1 m] deep beneath the trees.
फिर दो - तीन हफ्ते बाद, एक और इंजेक्शन दिया जाता है ताकि पहले दी गयी खुराक बेअसर न हो ।