Paracoccus marginatus Williams and Granara de Willink was found to cause serious damage on jatropha in India, Malaysia and Sri Lanka. The infestation resulted in symptoms like crinkling or twisting of leaves and shoots, bunched and unopened leaves, yellowing of leaves or leaf drop, fruit drop, appearance of honey dew on leaves, sooty mould development, stunted growth, deformation and death of the plants in case of severe infestation. Ferrisia virgata (Ckll.), Phenacoccus herreni Cox & Williams and Planococcus minor (Maskell) are known to attack Jatropha sp. In California, roots of Jatropa were found infested with the mealybug Rhizoecus bicirculus McKenzie. A prediction model has been developed which could act as an indicator of the severity of the mealybug Paracoccus marginatus damage in jatropha plantations, under tropical conditions, if no proper pest management measures had been.
KeywordsTropical Condition Sooty Mould Ladybird Beetle Fruit Drop Leaf Drop
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