Modelling biological control dynamics of the banana weevil Cosmopolites sordidus (Germar) by generalist predators in a banana agroecosystem

2021 ◽  
Vol 11 (1) ◽  
pp. 37
Author(s):  
Eliab Horub Kweyunga ◽  
Julius Tumwiine ◽  
Eldad B. Karamura
Keyword(s):  
Biological Control ◽  
Cosmopolites Sordidus ◽  
Generalist Predators ◽  
Banana Weevil

scholarly journals Controle biológico do gorgulho da bananeira Cosmopolites sordidus Germar com a utilização de diversas cepas de Beauveria bassiana em condições de laboratório / Biological control of the banana weevil Cosmopolites sordidus Germar with the use of several Beauveria bassiana strains under laboratory conditions

2021 ◽  
Vol 4 (4) ◽  
pp. 5527-5542
Author(s):  
Andy Ronquillo Moran ◽  
Gustavo Vàsconez Galarza ◽  
Yary Ruiz Parrales ◽  
Dario Dueñas Alvarado ◽  
Luis Suarez García ◽  
...  
Keyword(s):  
Biological Control ◽  
Beauveria Bassiana ◽  
Cosmopolites Sordidus ◽  
Banana Weevil ◽  
Laboratory Conditions

O gorgulho da bananeira Cosmopolites sordidus (Germar, 1824) (Coleoptera: Curculionidae) é uma praga de importância econômica no cultivo da bananeira, portanto, novas alternativas são necessárias para reduzir sua incidência. O estudo foi realizado no ambiente do Laboratório de Entomologia da Faculdade de Ciências Agrárias da Universidade Técnica de Babahoyo, onde foi avaliada a eficácia de diversas cepas de B. bassiana no controle de C. sordidus em condições de laboratório. Foram utilizados 12 tratamentos, que se baseiam na aplicação de diversas cepas de B. bassiana e um controle químico com diferentes doses, com três repetições por tratamento, distribuídos em um ensaio de blocos completos casualizados, onde foram feitas as comparações das médias com os Teste de intervalo múltiplo de Tukey a 95% de probabilidade. Os insetos C. sordidus foram coletados nas fases larva, pupal e adulta dos rebentos de bananeiras afetadas no campo, as quais foram desinfetadas com hipoclorito de sódio a 0,5%, para evitar qualquer tipo de contaminação. As larvas e pupas foram submetidas a completar seu ciclo biológico até a obtenção do adulto. A inoculação do fungo nos insetos adultos de C. sordidus foi realizada por micropulverização com micropipetas, na parte dorsal do inseto adulto com 5 dias de emergência. Os insetos adultos inoculados foram colocados em placas de Petri com 30 gramas de pseudocaule e 30 gramas de rizoma fresca, previamente desinfetados. Para cada tratamento, 5 insetos adultos foram colocados com três repetições, avaliando-se a cada 5, 8, 10 dias após a inoculação. Para estimar corretamente os efeitos dos tratamentos, foram coletados dados sobre o número de insetos mortos, a porcentagem de insetos adultos com crescimento de micélio de B. bassiana e a porcentagem de mortalidade. Pelos resultados obtidos, determinou-se que o tratamento 8 (BbPLUS (B. bassiana) 11,5 ml / L) e o tratamento 9 (BbPLUS (B. bassiana) 12,5 ml / L) apresentaram mortalidade de 80% em adultos de gorgulho preto após 8 e 10 dias após a inoculação. 

A NEW STRATEGY FOR THE BIOLOGICAL CONTROL OF THE BANANA WEEVIL (COSMOPOLITES SORDIDUS GERMAR) IN EAST AFRICA

2000 ◽  
pp. 291-292
Author(s):  
M. Griesbach ◽  
R.-P. Schuster ◽  
R.A. Sikora ◽  
C.S. Gold ◽  
P.R. Speijer
Keyword(s):  
Biological Control ◽  
East Africa ◽  
Cosmopolites Sordidus ◽  
Banana Weevil ◽  
New Strategy

scholarly journals Biological Control of Pest Non-Marine Molluscs: A Pacific Perspective on Risks to Non-Target Organisms

Insects ◽  
2021 ◽  
Vol 12 (7) ◽  
pp. 583
Author(s):  
Carl C. Christensen ◽  
Robert H. Cowie ◽  
Norine W. Yeung ◽  
Kenneth A. Hayes
Keyword(s):  
Biological Control ◽  
Environmental Impacts ◽  
Pacific Islands ◽  
Generalist Predators ◽  
Snail Species ◽  
Marine Mollusk ◽  
The Pacific ◽  
History Of ◽  
Ecosystem Level ◽  
Scientific Framework

Classic biological control of pest non-marine mollusks has a long history of disastrous outcomes, and despite claims to the contrary, few advances have been made to ensure that contemporary biocontrol efforts targeting mollusks are safe and effective. For more than half a century, malacologists have warned of the dangers in applying practices developed in the field of insect biological control, where biocontrol agents are often highly host-specific, to the use of generalist predators and parasites against non-marine mollusk pests. Unfortunately, many of the lessons that should have been learned from these failed biocontrol programs have not been rigorously applied to contemporary efforts. Here, we briefly review the failures of past non-marine mollusk biocontrol efforts in the Pacific islands and their adverse environmental impacts that continue to reverberate across ecosystems. We highlight the fact that none of these past programs has ever been demonstrated to be effective against targeted species, and at least two (the snails Euglandina spp. and the flatworm Platydemus manokwari) are implicated in the extinction of hundreds of snail species endemic to Pacific islands. We also highlight other recent efforts, including the proposed use of sarcophagid flies and nematodes in the genus Phasmarhabditis, that clearly illustrate the false claims that past bad practices are not being repeated. We are not making the claim that biocontrol programs can never be safe and effective. Instead, we hope that in highlighting the need for robust controls, clear and measurable definitions of success, and a broader understanding of ecosystem level interactions within a rigorous scientific framework are all necessary before claims of success can be made by biocontrol advocates. Without such amendments to contemporary biocontrol programs, it will be impossible to avoid repeating the failures of non-marine mollusk biocontrol programs to date.

Assessing the role of generalist predators in the biological control of alfalfa weevil (Coleoptera: Curculionidae)

2017 ◽  
Vol 149 (4) ◽  
pp. 525-533 ◽  
Author(s):  
Tatyana A. Rand
Keyword(s):  
United States ◽  
Biological Control ◽  
Experimental Work ◽  
United States Of America ◽  
Acyrthosiphon Pisum ◽  
The United States ◽  
Generalist Predators ◽  
Alfalfa Weevil ◽  
Exclusion Experiment ◽  
Predator Exclusion

AbstractAlfalfa weevil (Coleoptera:Curculionidae) is a major pest of alfalfa throughout the United States of America. Biological control research has disproportionately focussed on introduced parasitoids. Generalist predators may also be important, but experimental work evaluating their impacts is lacking. I combined a cross-site survey with a predator exclusion experiment to identify key predators, and test for impacts on weevil survival and plant defoliation levels in Montana and North Dakota, United States of America. Spiders (Araneae) dominated the complex, followed by Nabidae (Hemiptera) and Coccinellidae (Coleoptera). None of the dominant predators showed aggregative responses to weevil (Hypera postica (Gyllenhal); Coleoptera: Curculionidae) or pea aphid (Acyrthosiphon pisum (Harris); Hemiptera: Aphididae) densities across 10 sites surveyed. However, weevil densities were positively correlated with both coccinellid and nabid densities across transects at the experimental site. Thus, predator groups traditionally associated with aphids can show strong aggregative numerical responses to alfalfa weevil larvae at smaller scales. Predator exclusion revealed no significant predator effects on larval survival or alfalfa damage. However, final densities of pea aphids were significantly higher in exclusion treatments relative to controls. The results suggest that even under conditions where predators exert significant pressure on aphids, they may still have minimal impacts on weevils. Additional experimental work is necessary to determine the broader potential of generalist predators as alfalfa weevil control agents.

scholarly journals Variation among banana weevil Cosmopolites sordidus (Germar) populations in Uganda as revealed by AFLP markers and corm damage differences

2018 ◽  
Vol 7 (1) ◽  
Author(s):  
Charles K. Twesigye ◽  
Kenneth Ssekatawa ◽  
Andrew Kiggundu ◽  
Wilberforce Tushemereirwe ◽  
Enock Matovu
Keyword(s):  
Aflp Markers ◽  
Cosmopolites Sordidus ◽  
Banana Weevil

Evidence for the presence of chemicals attractive to the banana weevil, Cosmopolites sordidus (Coleoptera: Curculionidae) in dead banana leaves

1999 ◽  
Vol 89 (6) ◽  
pp. 485-491 ◽  
Author(s):  
H. Braimah ◽  
H.F. van Emden
Keyword(s):  
Host Plant ◽  
Leaf Senescence ◽  
Integrated Management ◽  
Dead Leaf ◽  
Cosmopolites Sordidus ◽  
Banana Weevil ◽  
Entomogenous Fungi ◽  
Plant Odours ◽  
Banana Leaves ◽  
Soybean Leaves

AbstractThe effects of host and non-host plant odours on the foraging responses of the banana weevil, Cosmopolites sordidus (Germar), were investigated in the laboratory through arena and olfactometer bioassays. Contrary to previous reports that banana rhizome and pseudostem were the most attractive parts to the weevil, dead leaves were most preferred. Comparison of dead banana leaves with dead leaves of other plants showed that attractant odours were present in yam, cocoyam and dead grasses but absent in cocoa and soybean leaves. Complete leaf senescence while the leaf was attached to the mother plant proved necessary for the development of the dead-leaf-based odours but the involvement of microbial organisms could not be demonstrated. It is possible that dead-leaf-based attractants could be used in combination with microbials such as entomogenous fungi and nematodes in integrated management of C. sordidus.

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