[Ecological studies on popular leaf psyllid Camarotoscena speciosa flor. (Homoptera: Psyllidae) in Mosul]
1990
Al-Maroof, I.N.
Poplar psyllid (Camarotoscena speciosa Flor.) is one of the most important pests on Populus nigra trees in Mosul area. The population density and natural enemies of the poplar leaf psyllid were studied during 1985 and 1986 seasons at Ninevah Forest Plantation. Adults began to emerge from hibernation and attack poplar leaves during the 1st week of April. Females started laying eggs in the 3rd week of April and egg population tended to increase with some oscillation until November when it decreased markedly to disappear completely by early December at most. The highest densities of nymph population took place during June with weekly means of 204 and 269/10 leaves on 1985 and 1986, respectively. Eggs and nymphs populations were significantly correlated with temperature (+) and relative humidity (-). The insect has 4-6 generations per year under the prevailing field conditions. Most abundant predators were Anthocoris minki which comprised 81% of the total number of predators, while Orius sp. and Scymnus sp., represented 14.5% and 4.5% of the total predator complex, respectively. Predator population was also significantly positively correlated with temperature and negatively correlated with humidity
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