Avaliação dos danos de Hyalospila ptychis (Dyar) (Lepidoptera: Phycitidae) em coqueiro

Abstract

-The aim of this study was to evaluate the losses provoked by the moth Hyalospila ptychis (Dyar) on green-dwarf coconut trees at Una, State of Bahia, Brazil. Inflorescences of 100 trees were inspected monthly, from April 1997 to March 1998, in a 15 ha orchard. The number of coconuts per inflorescence, fruits damaged by H. ptychis, and fruit losses due to other causes, were recorded. The number of nuts per inflorescence followed a seasonal variation. The average losses caused by the pest were around 2% of the coconuts and the proportion of losses due to other causes was 59,4%. The number of coconuts lost for other causes and attacked by H. ptychis followed the seasonal variation of the number of fruits per inflorescence. The percent of coconuts attacked by H. ptychis was significantly and positively correlated with monthly average temperature.

Parisoschoenus obesulus Casey (Coleoptera: Curculionidae) não é praga de frutos novos do coqueiro

“…Caso P. obesulus causasse danos aos frutos normais, haveria sinais de ataque sobre as sépalas e/ou parte lateral fruto, a exemplo do que se observa no ataque da traça Hyalospila ptychis (Dyar) (Moura et al 2006). Assim, pressupor que P. obesulus possa ser responsável pelo abortamento dos frutos é errôneo.…”

Choice of food resource by bees and ants (Hymenoptera: Apoidea, Formicidae) on coconut tree inflorescences (Cocos nucifera, Arecaceae)

“…This favors direct auto-pollination (Conceição et al 2004). This kind of pollination can help to reduce problems related to low coconut production, including decreasing the risk of nut abortion (Moura et al 2006).…”