Mehmet Salih Özgökçe

Biological features and life table parameters of the mealy plum aphidHyalopterus pruni on different apricot cultivars

Development, survival, reproduction rate, and population growth parameters of the mealy plum aphidHyalopterus pruni (Geoffroy) (Hom.: Aphididae) were evaluated on four different apricot cultivars (Tyrinte, Sakıt, Colomer, and Bebeco) under field conditions in the Van region of Turkey. Experiments were carried out on exterior leaves of trees, 1.5–2 m above the ground. Plexiglas clip-cells (25×6 mm) with the upper side covered by muslin were used in the experiments. The mealy plum aphid performed better on Tyrinte than on the other cultivars tested. The fastest development time (first instar to adult; 9.4 days), highest daily reproduction rate (2.6 offspring/aphid/day), and highest total fecundity (48.1 offspring/aphid) were obtained on Tyrinte. The intrinsic rate of increase — a good indicator of the growth potential of a population — of individuals fed on Tyrinte was significantly greater than that of individuals fed on cvs. Colomer and Bebeco. While mean generation times (To) of populations on different cultivars were close to each other, the net reproductive rate was the highest (29.45 offspring/aphid/generation) on Tyrinte and the population doubling time on Tyrinte was 18.7%, 25.2% and 26.3% faster than those of individuals on other cultivars tested. The results obtained in this study indicated that Tyrinte appeared to be the most susceptible to the mealy plum aphid among the cultivars tested.

Maternal age effects on fecundity and survival of Aphis fabae Scopoli (Hemiptera: Aphididae) on bean

Bu calismada baklayaprakbiti, Aphis fabae Scopoli (Hemiptera: Aphididae)’nin gelisme, ureme, omur, dol suresi, preovipozisyon, ovipozisyon ve post ovipozisyon sureleri ve canli kalma oranlari ustunde anne yasinin etkileri arastirilmistir. Denemelerde 1. 6. 11. ve 16. yaslarda annelerden alinan bireylerden olusturulan dort farkli populasyon incelenmistir. Her bir deneme grubu 45 tekerrurden olusturulmus ve yaprakbiti icin konukcu bitki olarak bakla bitkisi kullanilmistir. Denemeler 27.5±1 °C, %60±5 orantili nem ve 16:8 saat aydinlik kosullarinin saglandigi iklim kabinlerinde surdurulmustur. Her bir populasyon icin elde edilen veriler yasa bagli yasam cizelgesine gore degerlendirilmistir. Yasam cizelgesi parametrelerinin hesaplanmasinda Euler-Lotka esitliginden yararlanilmistir. Aphis fabae ’nin 1, 6, 11 ve 16 gun yasli disilerinden elde edilen populasyonlarinin hesaplanan yasam cizelgesi parametreleri, sirasiyla; kalitsal ureme yetenegi ( r m ) 0.369, 0.389, 0.349 ve 0.149 disi/disi/gun, net ureme gucu ( R o ) 16.466, 14.535, 7.802 ve 2.233 disi/disi, ortalama dol suresi ( T o ) 7.599, 6.873, 5.893 ve 5.388 gun, toplam ureme orani ( GRR ) 37.611, 28.126, 20.265 ve 16.000 disi/disi, artis orani siniri ( λ ) 1.446, 1.476, 1.417 ve 1.161 disi/gun olarak bulunmustur. Ergin omru sirasiyla 6.4, 6.8, 2.6 ve 0.4 gun, preovipozisyon 4 deneme grubu icin de 0 gun, ovipozisyon suresi sirasiyla 6.2, 8.3, 2.4 ve 0.4 gun, postovipozisyon sirasiyla 0.2, 0.2, 0.1 ve 0.0 gun ve dol suresi sirasiyla 7.0, 7.2, 5.9 ve 4.8 gun olarak belirlenmistir. Her bir populasyonun yasa-bagli canli kalma oranlari ( l x ) icin Weibull dagilimi kullanilarak en uygun egri denklemleri elde edilmis ve fonksiyonun parametreleri hesaplanmistir. Weibull dagiliminda hesaplanan parametrelere gore 1. ve 2. yas grubu populasyonlarin Holling’in 1. tip hayat egrisine benzedigi, 3. ve 4. yas grubu populasyonlarin ise 3. tip hayat egrisine uygun oldugu bulunmustur.

The distribution and habitat of Calomera littoralis mandli (Mandl, 1967) (Coleoptera: Cicindelidae) on the coastal margin of Lake Van in Turkey

Abstract The tiger beetle Calomera littoralis mandli was found at Lake Van in eastern Anatolia at 20 out of 47 localities surveyed during 2004–2005. It occurs in open habitats with fine sand mixed with clay or in salt-marshes and with little plant cover. Three groups of larval burrows were determined, with average openings of 1.54 mm, 2.46 mm and 3.80 mm. These correspond to the 1st, 2nd and 3rd larval instars.