Due to the great damage can be done by the scale insects not only by sucking the plant sap that give low photosynthesis and respiration, which leads to curling, yellowing, dropping to leaves, so malformation, dwarfing and decreasing fruit production ( quality and quantity ),even plant death; but also due to the excretion of large amount of honey dew that rich in sugars and nitrogenous components, so give a good media for sooty molt fungi that increase the inhibition of photosynthesis quality of plant (Radwan 2003); Where the mealy bugs only can losses 750 million American dollars per year ( Moffit , 1999 ). In addition to the insect secretion of toxic saliva that resulted in malformed leaf and shoot growth, these characteristic symptoms similar to damages caused by viruses (Fisher & Foresty,2008 ). In dense population the infestation appears not only on the lower surfaces, but also attack the upper surfaces, twigs, stems, fruits & even roots, it is difficult to remove them from the fruits (Hosny, 1939). .
On the other hand of bringing the associated insects: bees, ants and wasps that give the protection to these scales from their enemies in turn of taking the honey dew. These special ants (fondling) (Myremcophilies, Reda F. Baker et al., 2007) usually found in the vicin...
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...e natural enemies are introduced. In addition to the effect of these enemies and the other climatic factors on these three important scale insects are studied.
These present investigation aimed to study in addition to these ecological studies on the three previous pests which infest mango and guava trees under field condition at Qaliobiya governorate, to determined
the best time for controlling these pests; but also giving the best method of their control by alternative insecticides, e.g. [Mineral oils, I. G. R. and biological insecticides] and the synthetic insecticides and the comparison between them. .
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