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Examples
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Planococcus citri, and (in Papua New Guinea) P. dioscoreae, feed on the tubers and roots of yams, and can multiply to considerable numbers, causing shrivelling of the stored tubers.
Chapter 37 1987
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Mealy bugs (Planococcus citri and Phenacoccus gossypii) can kill individual stems or the whole plant: clean or treated planting material is important for control.
Chapter 37 1987
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Young plants are attacked by Ophiomyia phaseoli, Aphis craccivora, and Planococcus citri.
Chapter 7 1981
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Other extensively widespread pests which infest the yam tuber during storage are mealy bugs and yam mealy bugs (Aspidiella hartii and Planococcus dioscorea).
4 Yams 1978
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Division in all or any planes, colonies indefinite in shape and size, of cells in short chains, irregular clumps, pairs or isolated: -- _Micrococcus_ (Cohn), cells non-motile; _Planococcus_ (Migula), cells motile.
Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 2 "Baconthorpe" to "Bankruptcy" Various
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