Inheritance of Resistance to Spittle bug (Homoptera: Cercopidae) in Inter specific Brachiaria spp. Hybrids

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Apomictic cultivars of several Brachiaria Griseb. spp., selected directly from collections of natural germ plasm, are the most widely sown forages in the tropics. They arc particularly well adapted to acid, infertile soils typical of the vast South American savannas. Species of several genera of spittle bugs (Cereopidae) cause widespread and severe damage to pastures of susceptible Brachiaria cultivars. Highly antibiotic genotypes have been identified. The potential for genetic manipulation of resistance in highly antibiotic genotypes was assessed. A positive correlation between topcross parent and F1 family mean for percentage of adult emergence of Aeneolamia varia F. on artificially infested plants in the greenhouse indicated that resistance is under genetic control and should be easily manipulated in a plant breeding program. In a field study, heritability of spittle bug damage score on naturally infested plants was estimated from replicated half-sib families. The estimate of heritability of half-sib family means was0.44 (±0.098) 5 mo after transplanting, further supporting the conclusion that resistance can be readily manipulated in a breeding program.

Document Type: Research Article

Publication date: October 1, 1995

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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