Characterization of Resistance to Adult Spittlebugs (Hemiptera: Cercopidae) in Brachiaria spp

Nymphs and adults of several spittlebug (Hemiptera: Cercopidae) species are key pests of forage brachiariagrasses (Brachiaria spp.) in tropical America. To support current breeding programs, a series of experiments aimed at characterizing the mechanisms of resistance to adult feeding damage were car...

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Bibliographic Details
Published in:Journal of economic entomology 2013-08, Vol.106 (4), p.1871-1877
Main Authors: Aguirre, Lina M, Cardona, César, Miles, John W, Sotelo, Guillermo
Format: Article
Language:English
Subjects:
adult damage
Animals
Antibiosis
Brachiaria
Brachiaria - genetics
Brachiaria - physiology
Cercopidae
Female
Genotype
Hemiptera
Hemiptera - growth & development
Hemiptera - physiology
Herbivory
host-plant resistance
Male
Nymph - growth & development
Nymph - physiology
Pest Control, Biological
PLANT RESISTANCE
Plant Roots - genetics
Plant Roots - physiology
Species Specificity
spittlebug
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Summary:Nymphs and adults of several spittlebug (Hemiptera: Cercopidae) species are key pests of forage brachiariagrasses (Brachiaria spp.) in tropical America. To support current breeding programs, a series of experiments aimed at characterizing the mechanisms of resistance to adult feeding damage were carried out. Five genotypes were used: two susceptible checks (CIAT 0606 and CIAT 0654) and three nymph-resistant genotypes (CIAT 36087, CIAT 6294, and SX01NO/0102). Test insects were Aeneolamia varia (F.), A. reducta (Lallemand), and Zulia carbonaria (Lallemand). The nymphresistant genotypes showed tolerance to all spittlebug species tested. Tolerance in these genotypes can be classified as only moderate given the extent of losses (60–80%) caused by both female and male adults. None of the nymph-resistant genotypes had antibiotic effects on adults feeding on foliage. The results also indicated that antixenosis for feeding is not a plausible explanation for lower damage scores and less biomass losses in resistant genotypes. The fact that adult longevity (usually 8 d) was not affected when the adults were forced to feed on roots of a genotype with strong antibiotic resistance to nymphs is regarded as additional evidence that resistances to nymphs and to adults in Brachiaria are largely independent.
ISSN:0022-0493
1938-291X
0022-0493
DOI:10.1603/EC11189