Rice is the largest food crop in my country. There are many types of weeds in rice fields. The types of weeds vary from place to place. There are more than 200 kinds of weeds in rice areas across the country, among which the common ones are common and cause serious harm. There are about 40 kinds of main weeds in China. Among the main weeds, barnyard grass occurs and damages the largest area, followed by special sedge, duck tongue grass, flat-stemmed sedge, stephanotis and goldenrod.

The main weeds in the first-season rice areas in the mid- and cold-temperate zones of the northeast and northwest include barnyard grass, flat-stemmed gallweed, Japanese sedge, oxenia, cabbage, rainflower, firefly, and duckweed. , Spirogyra etc.

The main weeds in the first-season rice area in the warm temperate zone of the North China Plain include barnyard grass, special-shaped sedge, flat-stemmed sedge, cow's wool, water amaranth, snake intestine, water sedge, eye cabbage, and duckweed. , Spirogyra, firefly, rice grass, watercress, duckweed, stephania, etc.

The main weeds in the subtropical first and second season rice cultivation areas of the Yangtze River Basin in central China include barnyard grass, special-shaped sedge, oxgrass, water sedge, flat-stemmed sedge, eye cabbage, broken rice sedge, and duckweed. Glossula, dwarf sagittaria, water amaranth, stephanotis, hollow lotus seed grass, snake intestine, moshangcai, firefly and so on.

The main weeds in the first and second season rice cultivation areas in the subtropical areas of Yunnan-Guizhou and Qinghai-Tibet Plateau are barnyard grass, firefly, special sedge, sedge, duckweed, Alisma, oxenia, and flat-stemmed sedge. Grass, water sedge, dwarf sagittaria, apple, truncatula, mosangcai, etc.

The main weeds in the southern tropical and subtropical second-crop rice cultivation areas include barnyardgrass, special-shaped sedge, sedge, water dragon, duck tongue, dwarf sagittaria, sunshine fluttering grass, cow felt, water sedge, Crushed ricegrass, stephanotis, apple, etc.