ISSN: 0041-3216 (Online), 0041-3216 (Print)
Volume 60 Number 2
Chlorophyll depletion in leaves of field-grown cassava clones infested by cassava green spider mites, Mononychellus tanajoa (Bondar) (Acarina: Tetranychidae)
Leaves of 13 field-grown cassava clones (Manihot esculenta Crantz) infested by cassava green spider mites (CGM), Mononychellus tanajoa (Bondar), were rated for density of pubescence and percentage chlorotic leaf area, and analysed for chlorophyll a and b (chl) concentrations. CGM-induced leaf chlorosis and chl reductions were not influenced by the degree of pubescence. Early and late symptom-developing clones, as well as clones with significant (P = 0.01) and non-significant reductions in leaf chl contents, were recognized. The causes of the varied responses among the clones are discussed, and the suitability of selecting for high pubescence in cassava is questioned.
Keywords: Cassava; Chlorophyll; Mononychellus tanajoa; Leaves