[Ecological study on the pistachio psyllid (Agonoscena targionu) (licht.) (Homoptera psyllidae) in Mosulregion, Iraq]
1989
Mohammad, M.A. | Sheet, A.I.
An ecological study on the pistachio psyllid, Agonoscena targionii (Licht.) (Psyllidae, Homoptera) was conducted in Ninevah Governorate, Iraq during 1987 and 1988. The percentage of infestation varied from one region to another within the Governorate and was relatively higher at the Governorate centre (78%), while it was (54%) in Hammam Al-Alil, (30%) in Aski Mosul and (25%) in Homaidate regions. The pest occurred between the 2nd week of May and the end of October with peak abundance during the 4th week of September then overwintered as adult under bark and in crevecies of pistachio trees for the forthcoming 6 months from the end of October to the end of April. The 4th and 5th instar nymphs were attacked by an endoparasite belonging to the family Ceratopogonidae (Diptera). Rate of parasitism ranged 1.2 - 15.9%. Irrigation intervals for pistachio seedlings affected clearly and significantly the population density of nymphs than eggs. Average of nymphs number at irrigation every 3 days was 88.2/10 leaves, while it was 39 and 25 nymphs/10 leaves at irrigation every 5 and 7 days respectively. At the same periods of irrigation, average of eggs number were 118.6, 105 and 55.6 eggs/10 leaves, respectively
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