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Thesis (M.S.)--Montana State University--Bozeman, 2006. / Typescript. Chairperson, Graduate Committee: Michael A. Ivie. Includes bibliographical references (leaves 253-258).

Thesis (Ph. D.)--University of Texas at Austin, 2004. / Supervisors: Norma L. Fowler and Marcy E. Litvak. Vita. Includes bibliographical references. Available also from UMI company.

A systematic survey of the microbial and invertebrate natural enemies of Phyllophaga spp. was conducted from 1979 to 1981 in 45 localities in southern Quebec. Chronic but low (nonepizootic) rates of biotic regulation were found in all host life stages except eggs. The natural enemies included 36 species of predatory and parasitic insects, 15 mite species, six fungal species, five bacterial species, three different nematodes, one virus, one gordian worm, and one sporozoan. Microorganismal pathogenicities to white grubs were demonstrated by infectivity tests and laboratory bioassays using four methods of inoculation. Field-type microplot studies on the fungus Metarhizium anisopliae and the nematode Mikoletzkya aerivora were undertaken in 1982. The fungus and the nematode showed potential as biological suppressants of Phyllophaga grubs by causing 91% and 68% mortality, respectively. Twenty-seven chemicals were tested as attractants against P. anxia adults in 1981 in four localities in southern Quebec. Hexanoic acid was consistently the most attractive chemical to beetles of both sexes.

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Submitted by Marlene Santos (marlene.bc.ufg@gmail.com) on 2014-09-01T21:14:25Z No. of bitstreams: 2 Jardel Barbosa dos Santos_Dissertação.pdf: 686921 bytes, checksum: 5f7578ab9fe9227a6ae594ab6faa5a23 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) / Made available in DSpace on 2014-09-01T21:14:25Z (GMT). No. of bitstreams: 2 Jardel Barbosa dos Santos_Dissertação.pdf: 686921 bytes, checksum: 5f7578ab9fe9227a6ae594ab6faa5a23 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) Previous issue date: 2013-03-19 / Fundação de Amparo à Pesquisa do Estado de Goiás - FAPEG / This study had as objective to verify the potential use of seed treatment on soybean crop with insecticide in reducing the harm caused by white grub species present in Goiás state and Distrito Federal. For this three tests have been installed, two in areas with predominantly Phyllophaga capillata Blanchard, 1850 and one in area with Liogenys fusca Blanchard, 1851. The trials were installed in commercial soybean fields with the presence of damage, and the presence of larvae in second and third instar. After selecting the area, the soybean was removed and treatments sowed manually. Besides the check were evaluated in trial thiamethoxam (350 FS) at rates of 70 and 87.5 g active ingredient (a.i.)/100 kg of seeds, thiamethoxam + abamectin (350+500 FS) at rates of 70 +50 g a.i./100 kg of seeds, imidacloprid + thiodicarb (450 +150) FS at rates of 225 +75 g a.i. / 100 kg seeds, and fipronil (250 SC) at rates of 50 g a.i/100 kg seeds. In all trials was evaluated weekly plant mortality, and at 14 and 28 days after emergence (DAE) height and dry weight of shoot, length and dry weight of roots. The use of seed treatment showed lower plants mortality by P. capillata larvae, except fipronil at rates 50 g a.i./100 kg of seed. Among the insecticides evaluated the use of imidacloprid + thiodicarb highlighted in the protection of stand, a fact that was observed to final assessment at 56 DAE. In addition, there was also best effect of this insecticide in variables related to plant development and grain yield. However, in the area with a predominance of L. fusca, beyond the thiodicarb + imidacloprid, highlighted in reducing the damage the insecticide thiamethoxam at rates of 70 and 87.5 g a.i./100 kg of seed. Therefore, the use of seed treatment on the mentioned species is viable, but we observe that for satisfactory results with the use of seed treatment is important to correctly identify the predominant species. / Este trabalho teve como objetivo verificar o potencial de uso do tratamento de sementes de soja (Glycine max) com inseticidas na redução dos danos provocados pelas espécies de corós presentes no Estado de Goiás e no Distrito Federal. Para tanto foram instalados três ensaios, dois em áreas com predominância de Phyllophaga capillata Blanchard, 1850 e um em área com Liogenys fusca Blanchard, 1851. Os ensaios foram instalados em lavouras comerciais de soja, com presença de danos e de larvas em segundo e terceiro instar. Após a escolha das áreas, as plantas de soja foram removidas e os tratamentos semeados manualmente. Além da testemunha, foram avaliados nos ensaios os inseticidas thiamethoxam 350 FS, nas doses de 70 e 87,5 g de ingrediente ativo (i.a.) /100 kg de sementes, thiamethoxam 350 FS + abamectin 500 FS, na dose de 70+50 g de i.a./100 kg de sementes, imidacloprid + thiodicarb 450+150 FS, na dose de 225+75 g de i.a./100 kg de sementes, e fipronil 250 SC, na dose de 50 g i.a./100 kg de sementes. Em todos os ensaios foi avaliada, semanalmente, a mortalidade das plantas e aos 14 e 28 dias após a emergência (DAE) a altura e massa seca da parte aérea, e comprimento e massa seca do sistema radicular. A adoção do tratamento de sementes propiciou menor mortalidade de plantas pelas larvas de P. capillata, exceto pelo tratamento fipronil, na dose de 50 g de i.a./100 kg de semente. Dentre os inseticidas avaliados, o inseticida imidacloprid + thiodicarb destacou-se significativamente na proteção do estande, fato este que foi observado até à avaliação final, aos 56 DAE. Além disso, houve também efeito superior deste inseticida nas variáveis relacionadas ao desenvolvimento da planta e na produtividade de grãos. No entanto, na área com predomínio de L. fusca, além do inseticida imidacloprid + thiodicarb, destacou-se na redução dos danos o inseticida thiamethoxam nas doses de 70 e 87,5 g de ingrediente ativo/100 kg de sementes. Portanto, a utilização do tratamento de semente sobre as espécies citadas é viável, porém observa-se que para obtenção de resultados satisfatórios com a utilização do tratamento de sementes é importante à correta identificação das espécies predominante.

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