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.
|Published (Last):||2 December 2004|
|PDF File Size:||19.86 Mb|
|ePub File Size:||15.75 Mb|
|Price:||Free* [*Free Regsitration Required]|
This indicates either a possible incompatibility between Phenacoccus and Wolbachia, or the possibility that Wolbachia has only recently colonized this mealybug population. Pseudococcidae and Putoidae with data on geographical distribution, host plants, biology and economic importance. Yaseen M Exploration for natural enemies of Phenacoccus manihoti and Mononychellus tanajoa: Niche models, such as CLIMEX, are useful tools to indicate where and when such threats may extend, and can assist with planning for biosecurity and the management of pest invasions.
Akinlosotu and Leuschner, ; Zeddies et al.
Entomologia Experimentalis et Applicata, 85 2: International Development Research Centre, Ottowa. CLIMEX modelling of the potential global distribution of the citrus black spot disease caused by Guignardia citricarpa and the risk posed to Europe. Datasheet Phenacoccus manihoti cassava mealybug.
Theoretically, EI is scaled between 0 andand the larger the EI the more suitable the location for the species. The cassava plant a is mostly cultivated for its starchy roots b URL http: Google Earth images show that the central region of the Democratic Republic of the Congo is predominantly forested, with villages appearing to be relatively isolated, although a network of tracks and small roads can be found there.
Insectos plagas de la yuca. Prunings of infested plants, and the clothing, tools and vehicles of agricultural workers can become contaminated with the crawlers and so aid in their dispersal. Investigations on cassava in the Republic of Zaire. Host-Plant Resistence Cassava contains two significant compounds whose levels increase in response to mealybug infestation. Natural enemy activity following the introduction of Epidinocarsis lopezi Hymenoptera: Pseudococcidae in Congo, five years after the introduction of Epidinocarsis lopezi Hymenoptera: Number of generations per year P.
Pseudococcidaein southwestern Nigeria. We therefore suggest that climate is not a factor limiting the occurrence of P. As a positive control for species differentiation, adult females of Phenacoccus madeirensis from cassava plants grown in the CIAT fields were used. In addition, other evidence that the two forms are separate species was obtained from experiments showing the inability of the parasitoids of P.
There was a problem providing the content you requested
Also, wet meaoybug WSor rainfall mortality, explains predicted unsuitability across much of the wet tropics in Indonesia and the Philippines Fig. A Shaded areas are suitable under a natural rainfall scenario; B shaded areas are suitable under an irrigation scenario; C hatched areas are the irrigation areas identified by Siebert et al.
Glob Chang Biol Description and identification key According to the scale insect database ScaleNet  there are currently 26 mealybug species Hemiptera: Data Availability All cassaba data are within the paper.
Thus it would seem that parasitoids and competition from other cassava pests both contribute to restricting the populations of P.
The correlative or inductive approach estimates a species’ climatic preferences based on analyses of geographic occurrence data . Three NKWE treatments at weekly intervals protected cassava against established early instar nymphs; however, some phytotoxicity was observed.
The cassava mealybug, Phenacoccus sp. Williams Feb Thailand Chon Buri Numerous releases of A.
Crawlers commence feeding from phloem fluids in young leaves and stems, and pass through three nymphal instars before reaching maturity. To establish an integrated pest management program, information about the biology of pest species is basic. La cochenille du manioc et sa biocoenose au Congo – The biological control of cassava mealybug in Africa. As has been well demonstrated in Africa, this augurs well for efforts to reduce its threat through classical biological control using agents such as A.
Movement in air currents and transportation of infested stem planting material by man are the main methods by which the insect is dispersed over long distances. Observations on cassava mealybugs in the Americas; their biology, eco logy and natural enemies.
Bellotti Jul Cambodia Banteay Meanchey Approximately 20 newly oviposited eggs were placed on four apical leaves of each plant. Biological control of the cassava mealybug by Epidinocarsis lopezi in Africa: Using the same rationale, the lower optimal soil moisture Mea,ybug was mealybig marginally higher than plant permanent wilting point.
Pseudococcidae recorded on the genus Manihotof which 23 have been recorded on cassava, Manihot esculenta Euphorbiaceae.
cassava mealybug (Phenacoccus manihoti)
Observations were performed on 90 insects, with each insect representing a repetition. Warm water treatment of cassava meapybug. Annu Rev Ecol Evol Syst Our model predictions should be particularly important to guide management decisions for high risk areas where P. Because of incorrect model formulation, the modelled climatic suitability is unreliable, and may incorrectly influence management policies.
The authors have declared that no competing interests exist. Ezumah H, Knight A, editors.