ANTIBIOSIS IN Brachiaria jubata TO THE CERCOPIDS Zulia colombiana Lallemand AND Aenelamia reducta Lallemand
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Antibiosis and tolerance were detected in Brachiaria accessions screened for resistance to two spittlebug species (Cercopidae). Mortality of nymphs of Zulia colombiana and Aeneolamia reducta was higher on B. jubata CIAT 16531 and B. brizantha cv. Marandú compared with the susceptible B. decumbens cv. Basilisk and B. dictyoneura cv. Llanero. Fourth and fifth instar nymphs transferred from cv. Llanero to B. jubata CIAT 16531 suffered high mortality equal to that of controls reared exclusively on B. jubata CIAT 16531 Fourth instar nymphs transferred from B. jubata CIAT 16531. to cv, Llanero experienced low mortality, equal to control on cv. Llanero. However, fifth instar nymphs transferred from B. jubata CIAT 16531 to cv. Llanero experiended high mortality, suggesting a critical stage of susceptibility to the resistance factor present in B. jubata CIAT 16531 between fourth and fifth instars. Nymphs reared on B. jubata CIAT 16531 typically died during the lasa instar molt, often between apolysis and ecdysis, with abnormalities in the pharate adults.
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