Skip to main content Accessibility help
×
Home
Hostname: page-component-558cb97cc8-s4zlt Total loading time: 0.373 Render date: 2022-10-07T19:32:12.532Z Has data issue: true Feature Flags: { "shouldUseShareProductTool": true, "shouldUseHypothesis": true, "isUnsiloEnabled": true, "useRatesEcommerce": false, "displayNetworkTab": true, "displayNetworkMapGraph": false, "useSa": true } hasContentIssue true

Determination of damage threshold of green spider mite, Mononychellus tanajoa (Bondar) on Cassava

Published online by Cambridge University Press:  19 September 2011

T. O. Ezulike
Affiliation:
National Root Crops Research Institute, Umudike, P.M.B. 7006 Umuahia, Imo State, Nigeria
R. I. Egwuatu
Affiliation:
Department of Crop Science, University of Nigeria, Nsukka, Nigeria

Abstract

The damage threshold of the green spider mite, Mononychellus tanajoa (Bondar) on cassava was determined in the greenhouse using four levels of mite infestation namely: 5, 10, 15 and 20 adult mites per cassava plant. Cassava cuttings were planted in plastic buckets in the greenhouse. The plants were artificially infested at 10 weeks old after planting.

Visible symptoms of mite damage appeared on cassava leaves at 4 weeks after infestation and at this period, the average number of mites was found to be eight mites per leaf. The mean number of active stages of M. tanajoa (larvae, nymphs and adults) was highest at the infestation level of 20 mites per plant, followed by that of 15, 10 and 5, in that order. The mean number of eggs was also highest at the infestation level of 20 mites per plant.

Résumé

Le seuil du dommage economique causé par la mite, Mononychellus tanajoa (Bondar) sur le manioc fut determinée grâce une infestation d'un plant par 5, 10, 15 et 20 mites adultes dans une serre. Les plants de manioc furent plantés dans des seaux en plastique. Les plants de manioc furent infectées 10 semaines après la plantation. Les symptomes visibles du dommage causé par les mites apparaissaient sur les feuilles du manioc 4 semaines après l'infestation avec un nombre des mites par feuilles qui etait de 8. Le nombre moyen du stage actif de M. tanajoa (larves, chrysalydes et adultes) etait tres eleve a l'infestation de 20 mites par plant de manioc, suivit de 15, 10 et 5 mites. Le nombre moyen des ouefs fut aussi le plus eleve pour l'infestation de 20 mites par plant de manioc.

Type
Research Articles
Copyright
Copyright © ICIPE 1990

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Byrne, D. H., Bellotti, A. C. and Guerrero, J. M. (1983) The cassava mites. Trop. Pest Manage. 29, 378394.CrossRefGoogle Scholar
Collyer, E. (1964) Phytophagous mites and their predators in New Zeal and orchards. N. Z. J. Agric. Res. 7, 551568.CrossRefGoogle Scholar
McMurtry, J. A. (1970) Some factors of foliage condition limiting population growth of Oligonychus punicae (Acarina: Tetranychidae). Ann. Entomol. Soc. Am. 63, 406412.CrossRefGoogle Scholar
Stern, V. M., Smith, R. F., van den Bosch, R. and Hagen, K. S. (1959) The integrated control concept. Hilgardia 29, 181.CrossRefGoogle Scholar

Save article to Kindle

To save this article to your Kindle, first ensure coreplatform@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about saving to your Kindle.

Note you can select to save to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be saved to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

Find out more about the Kindle Personal Document Service.

Determination of damage threshold of green spider mite, Mononychellus tanajoa (Bondar) on Cassava
Available formats
×

Save article to Dropbox

To save this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you used this feature, you will be asked to authorise Cambridge Core to connect with your Dropbox account. Find out more about saving content to Dropbox.

Determination of damage threshold of green spider mite, Mononychellus tanajoa (Bondar) on Cassava
Available formats
×

Save article to Google Drive

To save this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you used this feature, you will be asked to authorise Cambridge Core to connect with your Google Drive account. Find out more about saving content to Google Drive.

Determination of damage threshold of green spider mite, Mononychellus tanajoa (Bondar) on Cassava
Available formats
×
×

Reply to: Submit a response

Please enter your response.

Your details

Please enter a valid email address.

Conflicting interests

Do you have any conflicting interests? *