3,4-Dichloropropionanilide for Control of Barnyardgrass in Rice

N Arkansas isopropvl N-(3-chlorophenyl)carbamate (CIPC) is 1recommended for controlling barnyardgrass (Echinochloa crusgalli (L.) Beauv.) in rice. Method and depth of seeding, time of application, and water management after treatment are critical when using CIPC to control barnyardgrass in rice (2,3,4). Rice is very susceptible to CIPC when roots of the seedlings contact the herbicide (1,4). A herbicide that is more selective and less sensitive to management and environment is needed to replace CIPC. In greenhouse and field studies 3,4-dichloropropionanilide3 was evaluated in 1959 for controlling barnyardgrass in rice. The objectives of the investigations were: (1) to determine the effect of 3,4-dichloropropionanilide on rice and barnyardgrass as influenced by rate and time of application, volume of solution, and method and depth of seeding, and (2) to study the response of different varieties of rice to 3,4-dichloropropionanilide.