The number of adults of Cerotoma arcuata tingomariana (Bechyné) in soybean (Glycine max) fields in Eldorado do Sul, RS, was recorded through the seasons 1989/90 and 1990/91. The samples were taken weekly using a sweep net and a ground cloth. The number of sampled insects was higher during soybean reproductive stage. Both sampling methods were equally efficient to sample C. arcuata tingomariana adults.

O trabalho teve por objetivo identificar e quantificar os inimigos naturais de adultos de Diabrotica speciosa (Germ.) coletados em diferentes plantas olerícolas entre maio de 1994 e abril de 1995 em Pelotas, RS (lat. 31°, 52'S, long. 52°, 21'W). Os inimigos naturais mais freqüentes foram o taquinídeo Celatoria bosqi Blanch., o braconídeo Centistes gasseni Shaw e o fungo Beauveria bassiana (Bals.) Vuill. O nematóide Hexamermis sp. e o fungo Metarhizium anisopliae (Metsch.) Sorok. ocorreram em baixos níveis. Durante o ano, os menores percentuais de parasitismo foram observados no mês de dezembro (6,6%) e os maiores em abril (35,5%), resultando em um parasitismo médio anual em torno de 20%.

A survey of natural enemies of Diabrotica speciosa (Germ.) adults collected on different vegetable crops in Pelotas, RS (lat. 31°,52'S, long. 52°, 21 'W) was conducted. The most frequent natural enemies were the tachinid Celatoria bosqi Blanch., the braconid Centistes gasseni Shaw and the fungus Beauveria bassiana (Bals.) Vuill. The nematode Hexamermis sp. and the fungus Metarhizium anisopliae (Metsch.) Sorok. occurred at low levels. The lowest percentage of parasitism was observed in December (6.6%) and the highest in April (35.5%), with an yearly average of ca. 20%.