Turkish Journal of Entomology (2007) 31, 21-34
Abdurrahman Yigit, Erdal Sertkaya and Murat Tiryakioglu (2007)
[Population fluctuations of cereal aphids, Rhopalosiphum padi (L.) and Sitobion avenae (F.) (Homoptera: Aphididae) and their impact on crop loss parameters of wheat]
Turkish Journal of Entomology 31 (1), 21-34
Abstract: Population fluctuations of cereal aphids, Rhopalosiphum padi (L.) and Sitobion avenae (F.), (Homoptera: Aphididae) and their impact on crop loss parameters of wheat were revealed in Antakya during the years of 1998-2002. The aphid populations were recorded in infested and aphid-free plots in Reyhanh by seven day intervals from 22 February to 22 April, 1999 on two wheat varieties, 'Genç-99' and 'Ege-88'. Twenty plants were examined at each sampling date and alive induviduals (adult+nymph) were counted. Mean plant height, spike length (cm), number of maximum stems, number of spikes, number of spikelets pers pike, number of grain per spike were not effected, while hectoliter weight, spike yield, and grain yield (except 'Ege-88') were differed between the infested and aphid-free plots, significantly. The population densities were higher and occured in early stages in the growing seasons of 1998-1999 than those of 2000 to 2002.
Predatory insects, Coccinella septempunctata (L.), C. undecimpunctata L., Synharmonia conglobata (L.), Adonia variegata (Goeze), Episyrphus balteatus (DeGeer), Metasyrphus corollae (F.), Melanostoma mellinum (L.), Meliscaeva auricollis (Meigeu), Sphaerophoria scripta (L.), Chrysoperla carnea (Stephens) and parasitoid, Aphidius uzbekistanicus Luthetzki and entomopathogenic fungi, Metarhizium sp. were found to be as natural enemies of the cereal aphids.
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(original language: Turkish)
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Research topic(s) for pests/diseases/weeds:
population dynamics/ epidemiology
damage/losses/economics
Research topic(s) for beneficials or antagonists:
surveys/distribution/isolation
