Abstract
The effect of the cassava green mite Mononychellus tanajoa on the growth and yield of cassava Manihot esculenta was studied over a 10-month period in two field trials near Lake Victoria in Kenya. One plot was maintained free of mites by means of acaricide, while the other was artificially infested.
The highest population density of M. tanajoa occurred during the dry season. A maximum leaf area index (LAI) of about 2 was reached at the onset of the dry season. The total leaf area of mite infested plants was reduced compared with uninfested plants during the dry spell. During the following rainy season infested plants recovered and attained the same leaf area as uninfested plants. A multiple regression model predicting the leaf area showed that 58% of the seasonal variation could be explained by plant age, soil water, and leaf injury.
The net growth rate of infested plants was lower than that of uninfested plants. Maximum values of 21 (infested plants) and 49 (uninfested plants) g m-2 week-1 were attained at the onset of the second rainy season. No difference was found between uninfested and infested plants with respect to net assimilation rates per unit leaf area during the dry season. The net assimilation rates reached a maximum almost at the same time as the growth rates, but the infested plants peaked slightly earlier and at a lower level than the uninfested plants.
M. tanajoa did not affect the relative allocation of dry matter into stems and storage roots, but the absolute allocation of dry matter declined with increasing mite injury. Thus, after 10 months the dry matter of infested plants was reduced by 29% and 21% for storage roots and stems, respectively, compared with the uninfested plants.
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AslamM., LoweS.B. and HuntL.A., 1977. Effect of leaf age on photosynthesis and transpiration of cassava (Manihot esculenta). Can. J. Bot., 55: 2288–2295.
BardnerR. and FletcherK.E., 1974. Insect infestations and their effects on the growth and yield of field crops: a review. Bull. ent. Res., 64: 141–160.
BellottiA.C. and vanSchoonhovenA., 1978. Mite and insect pest of cassva. Ann. Rev. Entomol., 23: 39–67.
BoerboomB.W.J., 1978. A model of dry matter distribution in cassava (Manihot esculenta Crantz). Neth. J. agric. Sci., 26: 267–277.
ByrneD.H., BellottiA.C. and GuerreroJ.M., 1983. The cassava mites. Tropical Pest Management, 29(4): 378–394.
ByrneD.H., GuerreroJ.M., BellottiA.C. and GracenV.E., 1982. Yield and plant growth responses of Mononychellus mite resistant and susceptible cassava cultivars under protected vs. infested conditions. Crop Science, 22: 486–490.
Cock, J.H., 1977. A physiological basis of yield loss in cassava due to pests. In: T. Brekelbaum, A. Bellotti and J.C. Lozano (Editors). Proceedings Cassava protection workshop, 7–12 November 1976, at Centro Internacional de Agricultura Tropical (CIAT), Cali, Colombia, pp. 9–16.
CockJ.H. and El-SharkawyM.A., 1988. Physiological characteristics for cassava selection. Expl. Agric., 24: 443–448.
CockJ.H., FranklinD., SandovalG. and JuriP., 1979. The ideal cassava plant for maximum yield. Crop Science, 19: 271–279.
ConnorD.J., CockJ.H. and ParraG.E., 1981. Response of cassava to water shortage. I. Growth and yield. Field Crops Research, 4: 181–200.
DeAngelisJ., BerryR.E. and KrantzG.W., 1983. Photosynthesis, leaf conductance, and leaf chlorophyll content in spider mite (Acari: Tetranychidae)-injured peppermint leaves. Environ. Entomol., 12(2): 345–348.
El-SharkawyM.A. and CockJ.H., 1987. Response of cassava to water stress. Plant and Soil, 100: 345–360.
Goldsworthy, P.R. and Fisher, N.M., 1984. Physiology of Tropical Field Crops. John Wiley & Sons Ltd. pp. 135–144.
GutierrezA.P., YaninekJ.S., WermelingerB., HerrenH.R. and EllisC.K., 1988. Analysis of biological control of cassava pests in Africa. III. Cassava green mite, Mononychellus tanajoa. J. Appl. Ecol., 25: 941–950.
HahnS.K., TerryE.R., LeuscherK., AkobunduI.O., OkaliC. and LalR., 1979. Cassava improvement in Africa. Field Crop Research, 2: 193–226.
HuntL.A., WholeyD.W. and CockJ.H., 1977. Growth physiology of cassava (Manihot esculenta Crantz). Field Crop Abstracts, 30(2): 77–91.
LianT.S. and CockJ.H., 1979. Branching habit as a yield determinant in cassava. Fields Crops Research, 2: 281–289.
MarkhamR.H., RobertsonI.A.D. and KirkbyR.A., 1987. Cassava green mite in east Africa: A regional approach to research and control. Insect Sci. Applic., 8: 909–914.
MendenhallM., 1968. Introduction to Linear Models and The Design and Analysis of Experiments. Wadsworth Publishing Company, Inc., Belmont, California 465 pp.
NachmanG., PedersenO.C., Münster-SwendsenM. and TomkiewiczJ., 1990. Sampling strategies for assessing the intra-plant density of the cassava green mite (Mononychellus tanajoa): A case-study. Exp. Appl. Acarol., 9: 31–49.
Nachman, G., Skovgård, H., Tomkiewicz, J., Münster-Swendsen, M. and Pedersen, O.C., 1992. Sampling strategies for assessing the overall density of the cassava green mite (Mononychellus tanajoa). Exp. & Appl. Acarol, (in press).
N'donga, M.F.O., Amadalo, B.A. and Markham, R.H., 1987. Assessment of losses due to the cassava green mite in western Kenya. In: R.H. Markham and I.A.D. Robertson (Editors), Cassava Green Mite in East Africa. Yield Losses and Integrated Control. Proceedings of a Regional Workshop, 26–30 May 1986, CAB International Institute of Biological Control. Nairobi, Kenya. pp. 62–69.
RamanujamT. and LakshmiK.R., 1984. The pattern of dry matter production and partitioning in cassava. Indian J. Plant Physiol., 27(2): 138–144.
Robertson, I.A.D., 1987. Cassava yield loss trials at the Kenya coast 1984–86: An assessment of the importance of cassava green mite. In: R.H. Markham and I.A.D. Robertson (Editors), Cassava Green Mite in East Africa. Yield Losses and Integrated Control. Proceedings of a Regional Workshop, 26–30 May 1986, CAB International Institute of Biological Control. Nairobi, Kenya. pp. 52–61.
SamwaysM.J., 1979. Immigration, population growth and mortality of insects and mites on cassava in Brazil. Bull. ent. Res., 69: 491–505.
SancesF.V., WymanJ.A., vanSteenwykR.A. and OatmanE.R., 1981. Spider mite interactions with photosynthesis, transpiration and productivity of strawberry. Environ. Entomol., 10(4): 442–448.
SAS Institute, 1985. SAS User's Guide: Statistics. Version 5 Edition. SAS Institute Inc., Cary, North Carolina, 956 pp.
SchulthessF., BaumgärtnerJ.U., DelucchiV. and GutierrezA.P., 1991. The influence of the cassava mealybug, Phenacoccus manihoti Mat.-Ferr. (Hom., Pseudococcidae) on yield formation of cassava, Manihot esculenta Crantz. J. Appl. Ent., 111: 155–165.
Skovgård, H., Tomkiewicz, J., Nachman, G., Münster-Swendsen, M., 1992. The dynamics of the cassava green mite Mononychellus tanajoa in a seasonally dry area in Kenya. Exp. & Appl. Acarol., (in press).
Tomkiewicz, J., Skovgård, H., Nachman, G. and Münster-Swendsen, M., 1992. A rapid and nondestructive method to assess leaf injury caused by the cassava green mite, Mononychellus tanajoa Bondar (Acarina: Tetranychideae). Exp. & Appl. Acarol., (in press).
van deVrieM., McMurtryJ.A. and HuffakerC.B., 1972. Biology, ecology; and pest status, and host-plant relationships of Tetranychids. Hilgardia., 41(13) 343–432.
YaninekJ.S., GutierrezA.P. and HerrenH.R., 1989b. Dynamics of Mononychellus tanajoa (Acari: Tetranychidae) in Africa: Experimental evidence of temperature and host plant effects on population growth rates. Environ. Entomol., 4: 633–640.
YaninekJ.S., GutierrezA.P. and HerrenH.R., 1990. Dynamics of Mononychellus tanajoa (Acari: Tetranychidae) in Africa: Effects on dry matter production and allocation in cassava. Environ. Entomol., 19(6): 1767–1772.
YaninekJ.S., HerrenH.R. and GutierrezA.P., 1987. The biological basis for the seasonal outbreak of cassava green mites in Africa. Insect Sci. Applic., 8: 861–865.
YaninekJ.S. HerrenH.R. and GutierrezA.P., 1989a. Dynamics of Mononychellus tanajoa (Acari: Tetranychidae) in Africa: Seasonal factors affecting phenology and abundance. Environ. Entmol., 4: 625–632.
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Skovgård, H., Tomkiewicz, J., Nachman, G. et al. The effect of the cassava green mite Mononychellus tanajoa on the growth and yield of cassava Manihot esculenta in a seasonally dry area in Kenya. Exp Appl Acarol 17, 41–58 (1993). https://doi.org/10.1007/BF00156943
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DOI: https://doi.org/10.1007/BF00156943