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Yield Earliness, and Fiber Properties of Cotton Carrying Combined Traits for Pink Bollworm Resistance

USDA-ARS, Western Cotton Res. Lab., 4135 E. Broadway, Phoenix, AZ 85040

^* Corresponding author.

The nectariless (N) and okra-leaf (L) traits confer low levels of resistance in cotton, Gossypium hirsutum L., to pink bollworm (PBW), Pectinophora gossypiella (Saunders). The semi-smoothleaf (SS) trait reduces the amount of leaf trash in mechanically harvested seedcotton. The main objective of this study was to compare NL (or NSSL) isolines with N (or NSS) isolines and with check cultivars for resistance to PBW, lint yield, earliness, and fiber properties. The experiments were grown at three locations: Tempe, AZ; Maricopa, AZ; and Brawley, CA. In three experiments grown without the use of insecticide, two of the six NL (or NSSL) isolines (DES 56NL and DES 24NSSL) had significantly less seed damage caused by PBW, did not yield significantly less lint, were significantly earlier, and had deficient to comparable fiber properties when compared with the N counterpart isolines. The Stoneville 825 NL isoline yielded significantly more lint and had fiber properties comparable to the N isoline, but was not earlier and did not have less seed damage. All N, NL, NSS, and NSSL lines that were compared with nectaried, regular-leaf cultivars sustained less seed damage, and most were equal in lint yield and earliness. In a fourth, insecticide-treated experiment, DES S6NL required fewer insecticide applications, had significantly less seed damage, and was earlier maturing than the nectaried, regular-leaf ‘Deltapine 61’ (DPL-61) at two locations, and yielded more lint at one location. Fiber of DES 56NL was shorter, weaker, and coarser, but had elongation strength equal to that of DPL-61. In three of the four experiments, some year x cotton and location x cotton interaction effects were significant. Thus, in spite of some deficiencies in properties and performance, cotton germplasm lines are becoming available that combine PBW resistance with yield potential, earliness, and fiber properties that approach or equal those traits in cultivars

Received for publication November 27, 1987.