PROTEÇÃO DE PLANTAS Influência da Época de Colheita e do Genótipo de Cana-de-açúcar sobre a Infestação de Mahanarva fimbriolata (Stal) (Hemiptera: Cercopidae)

ABSTRACT Œ The objective of this work was to study the effect of harvest period and sugarcanegenotypes on Mahanarva fimbriolata (Stal) infestation. Under field conditions, 18 genotypes wereharvested in three periods: May, August and October. The highest root froghoppers populations wereobtained in the field were sugarcane was harvested in may, probably because, during summer, whenthe root froghopper attack is more intensive, the plants were more grown. In consequence, the soil wasmore shaded and humid, favouring the root froghopper development. The genotypes IAC83-2396,SP80-1842 and RB825336 were severely attacked and were preferred by the pest. The cultivarsRB72454, RB835486 e IAC86-2210 also presented high populational levels. IAC82-3092,IAC87-3197 and PO86-1107 presented the smallest pest infestations.KEY WORDS: Insecta, root froghopper, Saccharum sp.RESUMO Œ O efeito da Opoca de colheita e dos genotipos de cana-de-acœcar sobre a infestacao dacigarrinha das raizes,