Field Resistance to Heliothis Species in Cotton Strains with Genetically Differing Resistance Backgrounds

S.J. Stringer and J.E. Jones


 
ABSTRACT

Cotton strains having differing sources of resistance to the Heliothis complex were evaluated for relative field resistance at one location in 1982 and 1983. The experimental strains were compared to susceptible check cultivars and to known resistant strains. Data from 2,400 fruit per entry indicated that all test strains had significantly less Heliothis damage than the cultivar checks and two-thirds suffered significantly less damage than the resistant checks each year.

In a related study conducted in 1983 and 1984, five different types of the red plant color trait (red leaf, red vein, red stem, red margin and red darwinii) were evaluated for relative field resistance to Heliothis spp. using near-isogenic lines of a stoneville 213 background (BC4). The isolines were compared with each other, their recurrent parent (La 213-613-011) and with the Stoneville 213 cultivar. No significant differences among entries were detected in amount of injury due to Heliothis or in number of Heliothis larvae, It is suggested that the red trait, including R(1), contributes little if any to Heliothis resistance.



Reprinted from 1985 Proceedings: Beltwide Cotton Production Research Conferences pp. 388 - 390
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998