Seasonal Trend of Green Spider Mite, Mononychellus Tanajoa Population on Cassava, Manihot Esculenta and its Relationship with Weather Factors at Moor Plantation
The population of green spider mite Mononychellus tanajoa (Bondar) was monitored on cassava for 52 weeks (mid October 1979 to mid October 1980) at Moor Plantation, Ibadan, Nigeria. Mite population was found to be high in the dry season (80.1 ± 57.7 per leaf) and low in the wet season (15.2 ± 13.5). There was a linear relationship between mite population and the weather factors investigated. The relationship was positive in the cases of temperature and radiation, and negative in those of rainfall and humidity. The high mite population in the dry season was attributed to the high temperature (27.9 ± 1.26°C) and radiation (39.1 ± 7.86) conditions which favoured development of the different stages in the life cycle of the mite. The low population in the wet season was attributed to the adverse effects of high rainfall (56.31 ± 33.14 mm) and humidity (87.29 ± 2.36%) on the mites. Seasonal fluctuations in mite population was attributed to the physiological condition of the host plant.
Key WordsCassava Manihot esculenta (Crantz) green spider mite Mononychellus tanajoa (Bondar) seasonal trend of mite population meteorological data linear relationship temperature radiation rainfall humidity physiological conditions mortality predators
Unable to display preview. Download preview PDF.
- Leuschner K., Terry E. and Akinlosotu T. (1980) Field Guide for Identification and Control of Cassava Pests and Diseases in Nigeria. Manual Series No. 3. International Institute of Tropical Agriculture, Ibadan, Nigeria.Google Scholar
- Muaka-Toko and Leuschner K. (1980) Aspects of the biology and control of Mononychellus tanajoa (Bondar) infesting Manihot esculenta (Crantz) in Southern Nigeria. Proceedings of Workshop on Cassava Outreach in Zaire. Mbanza-Ngungu, BasZaire, Zaire, May 1980 (In Press).Google Scholar
- Ngangaji M. F. (1975) The green cassava mite, Mononychellus tanajoa (Bondar) in Tanzania 1974. Paper presented at the Workshop on Cassava Improvement in Africa. UTA, Ibadan, November 1975.Google Scholar
- Nwanze K. (1978) Cassava pests survey report in Zaire. 6 September–27 October 1978.Google Scholar
- Nyiira Z. M. (1972) Report of investigations on cassava mite, Mononychellus tanajoa (Bondar). Rwanda Research Station, Kampala, Uganda.Google Scholar
- Nyiira Z. M. (1975) Advances in research on the economic significance of the green cassava mite, Mononychellus tanajoa (Bondar) in Uganda. Paper presented at the Workshop on Cassava Improvement in Africa. UTA, Ibadan, November 1975.Google Scholar
- Nyiira Z. M. (1977) Mononychellus tanajoa (Bondar), biology, ecology and economic importance. Proceedings of Cassava Protection Workshop, pp. 155–159.Google Scholar
- Yaseen M. (1975) Preliminary investigations on the biology and ecology of the green cassava mite, Mononychellus tanajoa (Bondar) in Trinidad. Paper presented at the Workshop on Cassava Improvement in Africa. UTA, Ibadan, November 1975.Google Scholar