Predação de sementes de Senna multijuga (Rich.) H.S. Irwin & Barneby (Caesalpinaceae) por bruquíneos (Coleoptera: Chrysomelidae)

Abstract

Neotropical Entomology 34(3): 521-525 (2005) Seed Predation by Bruchines (Coleoptera: Chrysomelidae) in Senna multijuga (Rich.) H.S. Irwin & Barneby ABSTRACT -Senna multijuga Rich. I. & B. (Caesalpinaceae) is an ornamental tree common in southeastern Brazil. To quantify the seed damage of bruchine species in this host plant, fruits were collected from 31 March to 30 May 2000 and stored in greenhouse, until emergence of the bruchines, which were then identified. Emerged beetles in these samples were 67% Sennius crudelis RibeiroCosta & Reynaud, 20% Sennius puncticollis (Fåhraeus) and < 1% Sennius nappi Ribeiro-Costa & Reynaud. Finally, 62% of seeds were undamaged, 26% were empty, 12% were damaged and the sum of empty and damaged seeds was 38%. Considering that other factors decrease seed germination, as pathogens and unfavorable weather conditions, this last pencentage may be very expressive. On the other hand, S. multijuga probably is related with strategies of dispersion and escape from predators as the small and numerous seed crops, which can minimize the losses caused by insect seed eaters. Here we highlight the need to study more fruitfication phases and to conduct germination seed tests to better understand the influence of Bruchinae predation on the S. multijuga reproductive capacity.

Predação de sementes de Acacia mearnsii De Wild. (Fabaceae, Mimosoideae)

“…Para avaliação de dano, as sementes foram removidas das vagens com auxílio de pinça e classificadas da seguinte forma: sementes sadias (com forma normal e livre de predação de insetos), sementes chochas (com formação anormal) e sementes predadas por insetos (Sari et al, 2005).…”

Smile, you are on camera or in a live trap! The role of mammals in dispersion of jackfruit and native seeds in Ilha Grande State Park, Brazil

“…Coleoptera or Lepidoptera larvae) in jackfruit seeds, which would be expected for large seeds in tropical forests (Sari & Ribeiro-Costa, 2005;Scherer & Romanowski, 2005;Silva et al, 2007;Andreazzi et al, 2011;Dracxler et al, 2011). We believe there has not been enough ecological time yet to allow insects to adapt to and use jackfruit seeds in invaded areas.…”

Paracrias pluteus (Hymenoptera, Eulophidae) in Brazil: new distribution and host records, and with a new host group for Paracrias

“…Bruchines ( Coleoptera : Chrysomelidae : Bruchinae ) are considered pests of seeds of native and cultivated legumes in Latin America, causing damage to several economically important agricultural species ( Rojas-Rousse et al 2007 ) such as Glycine max ( Costa et al 2007 ), Phaseolus coccineus , Phaseolus vulgaris , Phaseolus lunatus ( Hansson et al 2004 , Bonet 2008 ), Vigna radiata ( Somta et al 2008 ), Vigna unguiculata ( Aebi et al 2008 ), and tree species such as Enterolobium contortisiliquum ( Morandini and De Viana 2009 ), Melanoxylon brauna ( Santos et al 1991 ), Mimosa bimucronata ( Silva et al 2007 ), Sclerolobium sp. ( Santos et al 1997 ) and Senna multijuga ( Sari and Ribeiro-Costa 2005 ).…”