EVALUATION OF NEMATICIDES FOR CONTROLLING MELOIDOGYNE-INCOGNITA AND HOPLOLAIMUS-COLUMBUS ON KENAF (HIBISCUS-CANNABINUS)

The effectiveness of aldicarb, fenamiphos, and 1,3-dichloropropene in controlling Hoplolaimus columbus and a combination of H. columbus and Meloidogyne incognita on kenaf (Hibiscus cannabinus) was evaluated in two similar field experiments. One experiment was conducted in a field with a Fuquay sand infested with M. incognita and H. columbus. The second experiment was in a field with a Dothan loamy sand infested with H. columbus but not M. incognita. In the first experiment, in-furrow application of aldicarb at planting at rates of 0.59 and 1.18 kg a.i./ha reduced root galling but also significantly reduced early season plant growth by 23% and 41%, respectively, based on plant weight 21 days after planting. The higher rate of aldicarb also reduced kenaf yield 7 months after planting. Fenamiphos and 1,3-dichloropropene significantly reduced galling caused by M. incognita and increased yield. In both experiments, Hoplolaimus columbus infected and reproduced on kenaf but in the field where only H. columbus occurred, no yield increases were obtained b nematicide treatment.