COMMON COCKLEBUR (XANTHIUM-STRUMARIUM) INTERFERENCE WITH PEANUT (ARACHIS-HYPOGAEA)

Studies were conducted in Florida to evaluate interference of common c ocklebur with peanut. Peanut yield reduction ranged from 0 to 88% for common cocklebur densities of 0-32 plants 8 m(-1) of peanut row, and p redicted loss was similar under normal moisture conditions. When moist ure levels were above normal, the impact on yield was 9-24% less than when soil moisture was normal. Common cocklebur caused peanut yield lo ss if allowed to interfere for more than the first 2 wk after crop eme rgence, and peanut had to be common cocklebur free for at least 12 wk to prevent a yield reduction. These results show common cocklebur to b e more competitive with peanut than other weeds evaluated previously.