The Humidity Behavior of Cosmopolites sordidus (Coleoptera: Curculionidae)

Roth, Louis M.; Willis, Edwin R.

doi:10.1093/aesa/56.1.41

Cited by 38 publications

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“…Adult weevils were collected from farmers' fields in Masaka District in Uganda using pseudostem traps (Mitchell, 1978). Weevil sex was determined using curvature of the last abdominal segment (Roth and Willis, 1963) and punctuation on the rostrum (Longoria, 1968). Before release, weevils were scratched on the elytra with distinct marks for each banana mat.…”

Section: Methodsmentioning

confidence: 99%

Effect of mulching on banana weevil movement relative to pheromone traps

Tinzaara¹,

Gold²,

Dicke³

et al. 2010

African Crop Science Journal

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Banana weevil (Cosmopolites sordidus) is a major pest in East Africa causing yield losses of up to 14 metric tonnes per hectare annually. A study was conducted in Uganda to determine the effect of mulching on banana (Musa spp. L.) weevil, Cosmopolites sordidus (Germar) (Coleoptera: Curculionidae), movement relative to pheromone-baited traps. Three treatments were used to create different mulching levels: banana without mulch (control), banana with thin mulch (< 6 cm thick), and banana with thick mulch (15 cm thick). Pheromone traps were placed in the plots and weevil trap catches were monitored. Weevil catches in pheromone traps from both mulched and unmulched plots were generally similar. The mulching level had no effect on the ratio of males to females recaptured. The numbers of weevils captured in pheromone traps were lower than in the wet season and was not influenced by mulch levels. Mulching levels had a limited influence on the numbers of weevils recaptured from different directions. The results generally indicate that mulching has no effect on weevil catches in pheromone traps.

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Section: Methodsmentioning

confidence: 99%

Effect of mulching on banana weevil movement relative to pheromone traps

Tinzaara¹,

Gold²,

Dicke³

et al. 2010

African Crop Science Journal

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“…O ângulo de inclinação do último esternito abdominal e as distribuições das manchas no rostro são caracteres utilizados na sexagem de Cosmopolites sordidus Germar (Roth & Willis 1963, Longoria 1968. A forma do penúltimo tergito é utilizada na distinção dos sexos de adultos de Homalinotus coriaceus Gyllenhal (Sarro et al 2004), Amerrhinus ynca Salberg (Souza 2006), Conotrachelus nenuphar Herbst (Thomson 1932), Conotrachelus schoofi Papp (Tedders & Payne 1986), Conotrachelus neomexicanus Fall (Bodenham et al 1976) e Anthonomus pomorum L. (Duan et al 1999).…”

unclassified

Dimorfismo sexual do gorgulho-da-goiaba Conotrachelus psidii Marshall (Coleoptera: Curculionidae)

Silva-Filho¹,

Bailez²,

Viana-Bailez³

2007

Neotrop. entomol.

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-We investigate structural and behavioral differences between male and female adults of guava weevil, Conotrachelus psidii Marshall, 1922 to help in sex determination. Weevils collected from a commercial guava orchard were individually caged and maintained under laboratory conditions. Every day ten individuals were grouped and their behavior was observed. During mating the males and females were identified. Fifty weevils of each sex were killed and they were observed with stereoscopic microscope. The antenna insertion on the rostrum and hair on the thorax and abdomen surfaces were examined. Length and width of body, pronotum, last abdominal sternite and rostrum were also taken. Behaviorally, the male weevils produce audible sound by stridulation of abdomen while females do not. In the females, the body and pronotum width and body a rostrum length were higher than in the males, but the last abdominal sternite was smaller. Three other structural differences were visible with the naked eye: 1) the anterior region of pronotum have scarce hair or have not in the females and hair is dense in the males; 2) the last tergite of females is hidden by the penultimate tergite whereas in the males is visible; 3) the first abdominal sternite of females is more prominent, very convex and without or with little bristle. In the males it is slightly concave and with abundant hair. The male-female differences found in this work allow, without hurt or change insect behavior, an efficient sex determination of guava weevil.KEY WORDS: Sex differentiation, curculio, stridulation RESUMO -Este trabalho teve como objetivo determinar diferenças que permitam identificar o sexo de adultos de Conotrachelus psidii Marshall, 1922. Gorgulhos coletados em um pomar comercial de goiaba foram individualizados em caixas e mantidos em laboratório. Diariamente, dez gorgulhos eram agrupados e seu comportamento observado. Durante o acasalamento, os machos e as fêmeas eram identificados. Cinqüenta gorgulhos de cada sexo foram sacrificados e observados sob microscópio estereoscópico. Foram examinadas a inserção da antena no rostro e a distribuição de pilosidade na superfície do tórax e abdome. Também, foi medido o comprimento e a largura do corpo, pronoto, último esternito abdominal e rostro. Do ponto de vista comportamental, machos emitem sons por estridulação enquanto que as fêmeas não. A largura do corpo, do pronoto e o comprimento do corpo e do rostro nas fêmeas foram maiores, enquanto que a largura do último esternito abdominal foi menor. Três outras diferenças morfológicas são visíveis a olho nu: 1) A região anterior do pronoto das fêmeas possui pilosidade reduzida ou ausente enquanto que nos machos é abundante; 2) o último tergito nas fêmeas fica recoberto pelo penúltimo enquanto que nos machos é parcialmente visível; 3) o primeiro esternito abdominal nas fêmeas é mais proeminente, convexo e com pilosidade reduzida ou ausente. Nos machos esse segmento é ligeiramente côncavo e com pilosidade em toda a superfície. As diferenças entre machos e ...

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“…Similar trends have been found in Uganda, where weevil population decline was greater in fields subjected to high levels of sanitation [16,26]. However, it has been argued that the removal of residues may force weevils to oviposit on standing plants, thereby causing no net benefit on fruit production from reduced weevil populations [27]. Sanitation combined with determined trapping would address this, since trapping would exhaust the adult weevil population around banana mats.…”

Section: Effects Of Trap Types In Clean Versus Dirty Areasmentioning

confidence: 53%

“…The material used for traps was always inspected to make sure it was not infected with weevils or larval galleries. Since the weevils favour dark and moist conditions [27,28], all traps were covered with banana leaves after placement.…”

Section: Trapsmentioning

confidence: 99%

A farmer participatory research approach to assess the effectiveness of field sanitation and regular trapping on banana weevil populations

Rannestad¹,

Maerere²,

Torp³

et al. 2013

Fruits

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A farmer participatory research approach to assess the effectiveness of field sanitation and regular trapping on banana weevil populations.Abstract -Introduction. Small-scale banana producers in Tanzania are facing constraints caused by the destructive activities of the banana weevil (Cosmopolites sordidus Germar). Many currently used methods of addressing the problem are ineffective or too expensive for local farmers to implement. Materials and methods. A combination of two integrated pest management (IPM) tools (regular trapping in combination with field sanitation) was tested at two farmer-managed sites (Bujela and Kyimo) and one researcher-managed site (SUA-Morogoro). Treated areas were surrounded by untreated control areas where no trapping and limited sanitation was done. Changes in population densities were estimated by the mark-recapture procedure and the Lincoln index. Results and discussion. After eight months, weevil populations in the cleaned and trapped areas had been reduced by 33% (Bujela), 33% (Kyimo) and 74% (SUA). The change in population sizes in the control areas differed greatly, possibly due to discrepancies in field management between farmers' and researchers' practice. Trap types, areas and sites affected the number of weevils captured. Disc-onstump (DOS) traps captured more weevils than corm disc (CD) and pseudostem (PS) traps. Weevils responded more strongly to traps in the clean area at SUA compared with the other two sites, probably because the more rigid sanitation practices at SUA meant that volatiles from the traps were less likely to be masked by volatiles from surrounding residues. Conclusion. Regular trapping with field sanitation can greatly reduce populations of banana weevils, but strict adherence to method execution is required in order to gain favourable results. Tanzania / Musa / integrated pest control / Cosmopolites sordidus / traps / pseudostems / corms / farmer participation / cultivation / weeding Recherche participative avec les agriculteurs pour évaluer l'efficacité de l'assainissement en champ et du piégeage régulier des populations de charançons du bananier.Résumé -Introduction. En Tanzanie, les petits producteurs de bananes sont confrontés à des contraintes liées aux activités destructrices du charançon du bananier (Cosmopolites sordidus Germar). De nombreuses méthodes actuellement utilisées pour résoudre ce problème sont inefficaces ou trop coûteuses à mettre en oeuvre pour les agriculteurs locaux. Matériel et méthodes. Une combinaison de deux outils de lutte intégrée (IPM) (piégeage régulier combiné avec un assainissement du terrain) a été testée sur deux sites gérés par des agriculteurs (Bujela et Kyimo) et sur un site géré par des chercheurs (SUA-Morogoro). Les zones traitées ont été entourées de zones témoins non traitées où aucun piégeage ou assainissement n'ont été faits. Les variations de densité de la population ont été estimées par marquage-recapture et par utilisation de l'indice de Lincoln. Résultats et discussion. Après huit mois, les populations de ...

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The Humidity Behavior of Cosmopolites sordidus (Coleoptera: Curculionidae)

Cited by 38 publications

References 0 publications

Effect of mulching on banana weevil movement relative to pheromone traps

Effect of mulching on banana weevil movement relative to pheromone traps

Dimorfismo sexual do gorgulho-da-goiaba Conotrachelus psidii Marshall (Coleoptera: Curculionidae)

A farmer participatory research approach to assess the effectiveness of field sanitation and regular trapping on banana weevil populations

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