|Namken, N - TEXAS AG EXPER STATION|
Submitted to: Society of Nematology Meeting
Publication Type: Abstract Only
Publication Acceptance Date: October 14, 1995
Publication Date: N/A
Technical Abstract: Ten advanced breeding lines of Upland cotton (Gossypium hirsutum) were evaluated for lint yield production with and without 1,3- dichloropropene fumigation in a field infested with Rotylenchulus reniformis in the Lower Rio Grande Valley of Texas in 1992, 1993, and 1994. The susceptible control, Stoneville 453 (STV 453), yielded 739 and 400 kg/ha, respectively, with and without fumigation. Nine lines had higher yields (P less than or equal to 0.05) than STV 453 with or without fumigation and lower estimated losses to R. reniformis. Four lines yielded 57-86% more lint than the partially resistant cv. LA RN1032. In growth chamber experiments examining LA RN1032 and six of the lines, all had R. reniformis population multiplication factors of greater than 100, 10 weeks after inoculation; however, population densities increased more slowly on three of the lines than on STV 453. Three lines also were resistant to Meloidogyne incognita race 3, with a multiplication factor of less than 1.0, compared with 9.1 for STV 453 and 25.8 for root-knot nematode susceptible Deltapine 16.