Horizontal distribution pattern and population dynamic of aphids and associated predators on maize plants [electronic resource].

Includes references.

The distribution patterns and population dynamics of maize aphids Rhopalosiphum maidis (Fitch.), Aphis gossypii (Glov.) as well as theassociated predators Coccinella undecimpunctata and Paederus alfierii were conducted during year through middle and 4 cardinal directions of maize-field. Aphids infestation started at the second week of August and eached its maximum at the second week of September ( 110.64 insects / plant), then decreased to the lowest rate at the end of the same month (4.86 insects / plant). Density of the associated predators C. undecimpunctata and P. alfierii increased from the first week of August and attained the maximum at the first week of September and 24.th of August for C. undecimpunctata and P. alfierii, respectively. The maximum mean number of C.undecimpunctata and P.alfierii were 3.72 and 5.38 insects / plant, respectively, finally these values decreased to the minimum (0.2 insect/plant and 0.58 insects / plant, respectively) at the end of maize season.

Summary in Arabic.

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