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Selection of Entomopathogenic Nematodes against Dalaca pallens (Lepidoptera: Hepialidae) Chilean J. Agric. Res.
Maldonado,Alexis; Merino,Loreto; France,Andrés.
Dalaca pallens (Blanchard) is a pest with great impact on grassland production in Chile. The objective of this research was to evaluate the use of entomopathogenic nematodes (EPN) against D. pallens larvae. Twenty EPN isolates, collected along Chile, were used for nematode selection. The experimental unit consisted of five 50-mL plastic vials filled with Nothofagus dombeyi sawdust and inoculated with 40 dauers per vial. The experimental design was a completely randomized with four replicates per treatment. The results showed that isolate QU N3 (Steinernema australe) and QU N13 (Steinernema unicornum) produced the highest mortality, with 100 and 95% respectively and no differences (P < 0.001) between both. Later, these two isolates were used to calculate...
Tipo: Journal article Palavras-chave: Biological control; Lethal concentration.
Ano: 2012 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000200006
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Tolerance of disease‐vector mosquitoes to brackish water and their osmoregulatory ability ArchiMer
Kengne, Pierre; Charmantier, Guy; Blondeau‐bidet, Eva; Costantini, Carlo; Ayala, Diego.
Salinity tolerance is an important trait that governs the ecology of disease‐vector mosquitoes by determining their choice of larval habitat, and consequently their ecological and geographical distribution. Here, we used laboratory strains to determine the osmotic responses of larvae of obligate freshwater disease‐vector mosquitoes (Aedes aegypti, Aedes albopictus, Anopheles coluzzii, An. gambiae, Culex pipiens, and Cx. quinquefasciatus) and assessed their relationship with salinity tolerance. First, we analyzed the acute dose–mortality response of fourth‐instar larvae to salinity; then, we measured their hemolymph osmolality after 24‐h exposure to varying salinities. We found that Ae. albopictus was the most tolerant species, followed by An. coluzzii,...
Tipo: Text Palavras-chave: Adaptation; Aedes; Anopheles; Culex; Hemolymph osmolality; Lethal concentration; Mosquitoes; Osmoregulation; Salinity tolerance.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00585/69744/67634.pdf
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Toxicity of neem oil to Bemisia tabaci biotype B nymphs reared on dry bean. Repositório Alice
PINHEIRO, P.V.; QUINTELA, E.D.; OLIVEIRA, J.P. de; SERAPHIN, J.C..
The objective of this work was to determine the most susceptible nymphal stage of Bemisia tabaci biotype B to neem (Azadirachta indica A. Juss.) oil applied to dry bean (Phaseolus vulgaris L.) in a screenhouse. A solution of commercial oil (Dalneem) extracted from neem seeds was sprayed directly on each nymphal instar at 0, 0.1, 0.25, 0.5, 1 and 2% concentrations for lethal concentration (LC) determination, and at 0, 0.5 and 1% concentrations for lethal time (LT) determination. The number of living and dead nymphs was recorded five days after spraying for LC determination, and daily during six days for LT determination. The LC50 estimated for fourth instar nymphs occurred at 0.56% concentration. For all instars, LC50 and LC95 were estimated at 0.32 and...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Azadirachta indica; Phaseolus vulgaris; Immature stages; Lethal concentration; Whitefly; Estágios imaturos; Concentração letal; Mosca-branca.
Ano: 2009 URL: http://www.alice.cnptia.embrapa.br/handle/doc/125885
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ประสิทธิภาพของสารเคมีป้องกันกำจัดแมลงกลุ่มใหม่ต่อการควบคุมเพลี้ยกระโดดสีน้ำตาล (Brown planthopper, Nilaparvata lugens (Stål)) และผลกระทบต่อมวนเขียวดูดไข่ (Mirid bug , Cyrtorhinus lividipennis Reuter) Thai Agricultural
Sukanya Arunmit; Wantana Sriratanasak; Jintana Chaiwong.
Brown planthopper (BPH) is a major insect pest of irrigated rice cultivation areas in lower north, central and northeast Thailand. The field experiments were conducted to evaluate the efficacy of nine insecticides to control BPH in farmers’ fields at Suphan Buri, Nakhonayok and Ubon Ratchathani provinces. The results showed that the sulfoxaflor 50 % WG and pymetrozine 50 % WG were the most effective insecticides. The ratios of BPH/mirid bug (MB) in the buprofezin and pymetrozine fields were lower than other fields, which may indicate the less toxicity to MB compared with other insecticides. Moreover, toxicity of each insecticide to MB was investigated using a leaf dipping method and the result indicated that pymetrozine 50 % WG was the lowest toxicity to...
Tipo: Collection Palavras-chave: Rice; Insecticides; Efficacy of insecticides; Side-effect of insecticides; ฺBrown planthopper; Mirid bug; Suphan Buri province; Nakhonayok province; Ubon Ratchathani province; Lethal concentration; Side effects; ข้าว; สารเคมีป้องกันกำจัดแมลง; ประสิทธิภาพยาฆ่าแมลง; ผลกระทบยาฆ่าแมลง; เพลี้ยกระโดดสีน้ำตาล; มวนเขียวดูดไข่; สุพรรณบุรี; นครนายก; อุบลราชธานี; ระดับความเป็นพิษ; ผลข้างเคียงของยา.
Ano: 2015 URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5859
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