THE CASSAVA PLANT Cassava, Manihot esculenta Crantz (Euphorbiaceae) ( Figure ), is a perennial root crop native to tropical America and introduced into . Abstract: The cassava mealybug Phenacoccus manihoti (Hemiptera: Pseudococcidae) feeds by sucking the sap of cassava plants, causing damage directly by. Abstract: The cassava mealybug Phenacoccus manihoti (Hemiptera: Pseudococcidae) feeds cassava plants, causing damage directly by sucking the sap and.

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Cultural Control Use of manure or other fertilizers can result in a reduction in the mealybug population because improved nutrition results in the production of larger parasitoid wasps with higher fertility levels Schulthess et al. J Agric Urban Entomol Encyrtidae against the cassava mealybug, Phenacoccus manihoti Homoptera: Prunings of infested plants, and the clothing, tools and vehicles of agricultural workers can become contaminated with the mewlybug and so aid in their dispersal.

Two parameters captured mortality due to extreme heat, mainly limiting distributions in the African Sahel. Phenacoccus manihoti is pink and as mentioned above, reproduces by thelytokous parthenogenesis, whereas P.

Cassava contains two significant compounds whose levels increase in response to mealybug infestation. Location records may cassavaa reflect observations of an ephemeral population, rather than a permanent mmealybug. Phenacoccus manihoti Matile-Ferrero, adult female. Bulletin mealybub Entomological Research, 71 2: Oral rim tubular ducts completely absent ……………… Oral rim tubular ducts present ……………………………… Oral rim tubular ducts numbering 2 or 3 present next to each of most cerarii, each group with 1 duct larger than others.

Annu Rev Ecol Evol Syst Cassava production in Africa is increasing in response to famine, hunger and drought, and because of its general resistance to pests and diseases [ 3 ]. Ants attending mealybugs for their honeydew are known to defend the pests from natural enemies that would otherwise attack them. In this species, the first instar is also the most mobile stage P. Translucent pores never present on hind femora.


Multilocular disc pores absent entirely. The cassava transformation in Africa. Oral collar tubular ducts absent submarginally from dorsum of abdomen, present on margins ………………………………………………………………… Insect eradication can be achieved with insecticide or biopestide treatments designed to eliminate the pest from a delimited area [52][56].

The potential distribution of Chromolaena odorata Siam weed in relation to climate. One or more of the features that are needed to show you the maps functionality are not available in the web browser that you are using. Dorsal surface with setae, on posterior segments at least, broadly lanceolate and same size and shape as posterior cerarian setae …………………………………………………….

1. Cassava and mealybugs

Prior to the introduction of Apoanagyrus lopezi Hymenoptera: Herren and Neuenschwander casswva the biological control campaign against cassava mealybug in Africa. The biological control of cassava mealybug in Africa.

The cassava mealybug is a clear and present threat to the food security and livelihoods of some of the world’s most impoverished citizens. We will forward your request to your library as soon as possible. The differences in the projections of the two models for South America, Africa and Asia are shown in Fig 2. To streamline model development iterations, we first used the less computationally-demanding station database built into CLIMEX.

Mealhbug and casswva key According to the scale insect database ScaleNet [40] there are currently 26 mealybug species Hemiptera: Biological control of the cassava mealybug, Phenacoccus manihoti, by the exotic parasitoid Epidinocarsis lopezi in Africa.

cassava mealybug (Phenacoccus manihoti)

The pest-induced defoliation reduces availability of healthy leaves which are consumed as leafy vegetables in most of West and Central Africa. Successful eradication and containment rest on the ability to detect low-density populations, demanding the development of species-specific surveying methods that are practical and cost effective [52][53][56].

Four parameters DV0-DV3 captured the temperature optima and bounds for growth. It may be advisable to discourage ants in cassava fields if this becomes a problem. Mitteilungen der Schweizerischen Entomologischen Gesellschaft, 59 Proceedings of an international workshop.


Phenacoccus manihoti (cassava mealybug)

Natural enemy activity following the introduction of Epidinocarsis lopezi Hymenoptera: The reports of P. The mealybugs were observed on a daily basis until their life cycle was completed and information on the time of molting and mortality was recorded for each life stages.

Antennae are 6-segmented in first instars and 9-segmented in subsequent instars. Sutherst R, Bourne A. In that respect, our model could be used as a tool to design a risk-based surveying program, specific in space and in time, that improves the probability of detecting nascent P.

How to cite this article. Cahiers de la Recherche Developpement No. Biology of the cassava mealybug, Phenacoccus manihoti Mat. Numerous releases of A. Observations were performed on 90 insects, with each insect representing a repetition. Investigations on cassava in the Republic of Zaire. Reports in bold correspond to specimens studied to verify identification key and were deposited at the entomological reference collection of the International Center for Tropical Agriculture CIAT.

Biological Control On the basis of the exotic origin and rapid spread of the cassava mealybug in Africa, classical biological control has been the main and most appropriate approach to the pest problem.

Within a few years after these first reports, the insect became the major cassava pest and spread rapidly through most of the African cassava belt. Ducts on head and next to eighth pair of cerarii totaling 15— Experiments on the biological control of the cassava mealybug in Gabon: Like most websites we use cookies.