Pests and Diseases Viewer




Usually appear in

Spring to Autumn

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Caused By:-     Various Sap Sucking animals


Honeydew is a sugar-rich substance secreted by many sap sucking insects as they feed on a plant or tree. Their mouthpart penetrates the phloem of the leaf or plant and the high-pressure of the sap is forced into the gut of the animal. The insect usually cannot use all the sugary sap and some is excreted. The excreted sugary sap is flicked off or dropped onto the leaves below where it often forms the source for the proliferation of several moulds and the collection of many sooty particles. The leaves below then turns black and prevent photosynthesis. Honeydew is collected by barious other animals and honey bees, which process it into a dark, strong honey. Ants may even collect, or "milk," honeydew directly from aphids, which benefit from their presence due to their ability to drive away predators such as lady beetles. The ants also actively move aphids to other parts of the plant in order to farm the honeydew. Apart from the weakening of the affected plants by the loss of its sap. The main problem is the unsightly dirty moulds that form on the leaves of specimen plants. Sometimes he plants affected by moulds is not attacked, but it is the overhanging trees that harbour the sap sucking animals.


Spraying the plant with insecticide at the first sign of the sap sucking animals and hosing off the mould is all that is necessary.

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