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Passo Fundo, Brazil

Silva F.A.C.,Laboratory Of Bioecologia Of Percevejos | da Silva J.J.,Laboratory Of Bioecologia Of Percevejos | Depieri R.A.,Laboratory Of Bioecologia Of Percevejos | Panizzi A.R.,Laboratory Of Entomologia
Neotropical Entomology | Year: 2012

Greenhouse and laboratory studies were conducted to evaluate feeding activity and superficial damage to soybean seed by the brown-winged stink bug, Edessa meditabunda (F.), and the Neotropical brown stink bug, Euschistus heros (F.). Soybean plants (cv. BRS 282), at R6 stage of development were used. Thirty pairs of each species were used individually for 48 h. Two daily observations (9:00 AM and 3:00 PM) were taken to record the number of bugs (feeding/resting) on plant parts. Harvested seeds imbibed in tetrazolium solution were photographed for measurement of the damaged surface. Adult E. meditabunda significantly preferred soybean stems (19.7 bugs) to pods (2.7). Feeding/resting was similar at 9:00 AM (mean number of 28.0 bugs) and 3:00 PM (24.3). Euschistus heros equally fed/stayed on stems (7.3 bugs) and pods (6.9), although most bugs (12.3) remained on the cage net; feeding/resting on all plant structures amounted to 13.7 bugs at 9:00 AM and 17.7 bugs at 3:00 PM. Amylase activity was greater for E. heros (41.61 ± 0.89 U/mg) and almost none for E. meditabunda (2.35 ± 0.14 U/mg). The superficial damage to seeds was significantly greater for E. meditabunda (22.9 mm2) compared to E. heros (12.5 mm2). However, E. meditabunda caused less shrinkage of the seed tegument, while E. heros damage was deeper and seeds showed reduction in size. © 2012 Sociedade Entomológica do Brasil.

Depieri R.A.,Federal University of Parana | Panizzi A.R.,Laboratory Of Bioecologia Of Percevejos | Panizzi A.R.,Laboratory Of Entomologia
Neotropical Entomology | Year: 2011

Laboratory studies were conducted to compare duration of feeding and superficial and in-depth damage to soybean (Glycine max) seeds by the Southern green stink bug, Nezara viridula (L.), the Neotropical brown stink bug, Euschistus heros (F.), the red-banded stink bug, Piezodorus guildinii (Westwood), and the green-belly stink bug, Dichelops melacanthus (Dallas). Results indicated that feeding time was significantly longer for N. viridula (≈ 133 min) compared to E. heros and D. melacanthus (≈ 70 min), but not different from P. guildinii (≈ 103 min). There was a positive correlation between feeding time and the resulting damage for E. heros, N. viridula and P. guildinii (R2>0.80, P<0.0001), but not for D. melacanthus (R2 = 0.1011, P = 0.1493). The deepest seed damage (2.0 mm) was made by P. guildinii and the shallowest (0.5 mm) by D. melacanthus. The depth of the seed damage by E. heros and N. viridula (0.8, 1.2 mm, respectively) was intermediate in comparison to the other species studied. Feeding damage to the seed endosperm caused variable cell disruption and protein body dissolution, particularly when P. guildinii fed on seeds, suggesting that the deleterious action of salivary enzymes was greater for this bug compared to the others. © 2011 Sociedade Entomológica do Brasil.

Lazzarotto C.M.,Federal University of Parana | Lazzari S.M.N.,Federal University of Parana | Penteado S.R.C.,Laboratory Of Entomologia
Neotropical Entomology | Year: 2011

Greenidea ficicola Takahashi and Greenidea psidii van der Goot (Aphididae: Greenideinae) are Asian aphid species newly introduced in Brazil associated with Moraceae and Myrtaceae. The feeding behavior of G. ficicola and G. psidii was investigated on their respective host plants, Ficus benjamina (Moraceae) and Psidium guajava (Myrtaceae), using the Electrical Penetration Graph (EPG). Fifteen females of each aphid species were monitored during 24h using a DC-EPG GIGA-4 monitor. The time spent in phloem phase (waveforms E1 and E2) was 13.6% of the total recording time for G. ficicola and 0.8% for G. psidii. The average time in the pathway phase (waveforms C and pd) represented 50% of the total time for both species. Aphids spent more time in non-penetration and stylet pathway activities than in the phloem phase or actual feeding. The principal component analysis (PCA) showed that the two species formed different groups in relation to EPG parameters, despite some overlapping. The probing patterns with multiple penetrations of short duration in the sieve elements for both species may indicate apparent unsuitability for sustained feeding on their respective host plants. These results suggest that these two exotic species are in the process of adaptation to their host plants in their new environment and/or the plants may present either chemical or physical barriers against these insects. © 2011 Sociedade Entomológica do Brasil.

Navia D.,Laboratory Of Quarentena Vegetal | Marsaro A.L.,Laboratory Of Entomologia | da Silva F.R.,University of Amsterdam | Gondim M.G.C.,University of Pernambuco | de Moraes G.J.,University of Sao Paulo
Neotropical Entomology | Year: 2011

The presence of the red palm mite, Raoiella indica Hirst, is reported for the first time in Brazil. This invasive mite was found in July 2009 infesting coconut palms and bananas in urban areas of Boa Vista, State of Roraima, in northern Brazil. Comments on the possible pathways of R. indica into the country, present and potential impact of its introduction and mitigating measures to prevent or to delay the mite spread in Brazil are presented. © 2011 Sociedade Entomológica do Brasil.

Huerta H.,Laboratory Of Entomologia
Zootaxa | Year: 2010

Four new species of Scatopsidae from Mexico are described and illustrated based on adult morphology, two belonging to the genus Thripomorpha Enderlein and two to the genus Neorhegmoclemina Cook. These species are named Thripomorpha ungula, n. sp., Thripomorpha liliae, n. sp., Neorhegmoclemina dentata, n. sp. and N. raptoria, n. sp. The latter two represent the first record of Neorhegmoclemina Cook in Mexico. All of these species were collected with Malaise traps in the States of Hidalgo and Guerrero. © 2010 Magnolia Press.

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