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Estudo Populacional de Diabrotica speciosa (Ger.) (Coleoptera: Chrysomelidae) no Outono / Inverno

By Maurício Ursi Ventura and Marcos Roberto Gomes

Abstract

Population studies of D. speciosa on fall / winter crops were conducted. Larvae were monitored on maize (Zea mays L.), wheat (Triticum aestivum L.) and black oats (Avena strigosa Schreb.) and beetles on soybeans (Glycine max (L.) Mill., maize, common beans (Phaseolus vulgaris L.), wheat and black oats from March 23, 2001 to August 24, 2001. Soybean, maize, common beans, wheat and oats were sown on December 28, 2000; February 9, 2001; March 2, 2001; April 26, 2001 and May 11, 2001, respectively. Maize and common beans were grown on latter growing season. Adult beetles of D. speciosa were collected throughout the sampling period. Greatest beetles population peak occurred on wheat in August 3, 2001 which coincided with flowering period. Population dynamics of males and females was similar on common beans and soybeans. Females on maize predominate mostly after the first 30 days after the plant emergence (dae) (before were not detected) until about 45 dae. Males appeared to predominate during the flowering period. Similar population dynamics of males and females were found on wheat and black oats. Greatest peak of larvae occurred on maize roots. The growing season corn farm system was recently introduced, what probably explains the reports of increasing populations of adults during almost the whole year. Probable applications of the results are discussed.Estudo populacional de D. speciosa nas culturas de outono / inverno, foi conduzdo. Larvas foram monitorados, nas culturas do milho (Zea mays L.), trigo (Triticum aestivum L.) e aveia preta (Avena strigosa Schreb.) e adultos em soja (Glycine max (L.) Mill., milho, feijão (Phaseolus vulgaris L.), trigo e aveia preta de 23/03/2001 a 24/08/2001. A soja, milho, feijão, trigo e aveia preta foram semeadas em 28/12/2001, 9/02/2001, 2/03/2001, 26/04/2001 e 11/05/2001, respectivamente. Milho e feijão foram cultivados em "safrinha". Adultos foram coletados durante quase todo o período de amostragens. Os maiores picos populacionais ocorreram no trigo, em 3/08/2001, que coincidiu com o período de florescimento. A dinâmica populacional de machos e fêmeas foi similar no feijão e na soja. Na cultura do milho, fêmeas predominaram 30 dias após a emergência (dae) (antes não foram detectados) até cerca de 45 dae. Machos ocorreram principalmente durante o período de florescimento. Populações similares de machos e fêmeas foram verificadas no trigo e aveia preta. Maior pico de larvas ocorreu em raízes de milho. O milho safrinha foi introduzido há alguns anos e provavelmente é o fator que determina as crescentes populações da praga relatadas durante todo o ano. Possíveis aplicações dos resultados deste estudo são discutidas

Topics: Insecta, plantas hospedeiras, fenologia, safrinha, amostragens, Insecta, host plants, phenology, latter growing season, samples
Publisher: Universidade Federal de Santa Maria
Year: 2004
OAI identifier: oai:scielo:S0103-84782004000600042
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