The invention discloses a method for preparing a
plant agent for preventing and controlling rice blast. The
plant agent comprises 3,000 grams of wintergreen barberry root, 5,000 grams of
tobacco leaf, 3,000 grams of pepper, 5,000 grams of tea dreg, 500 grams of tallowtree leaf, 3,000 grams of pine needle, 5,000 grams of
camphor tree leaf, 2,000 grams of kuh-seng, 5,000 grams of garlic and 5,000 grams of kitazine. The method comprises the following steps: hammer-milling the wintergreen barberry root,
tobacco leaf, pepper, tea dreg, tallowtree leaf, pine needle,
camphor tree leaf and kuh-seng respectively and then combining the
powder together,
mashing the garlic, putting the combined
powder and the mashed garlic into a large iron pan together, adding 250 kilograms of water into the large iron pan, decocting the mixture with intense fire for 40 minutes and then with soft fire for 20 minutes, stopping the fire, filtering the decoction and taking the juice, adding the kitazine into the juice, and fully stirring the mixture for 30 minutes to form a finished product.