Konya ili Altinekin ilçesinde 1999 yilinda yürütülen bu çalismada monogerm ve triploid iki sekerpancari çesidi (Eureka ve S-814) ile 4 azotlu gübre dozunda (0 , 15 , 25 ve 35 kg/da) yaprakbiti populasyon gelisimi izlenmistir. Deneme tesadüf parsellerinde faktöriyel deneme desenine göre 3 tekerrürlü olarak planlanmistir. Sonuçta , sekerpancarinda koloni olusturan iki yaprakbiti türünden Aphis fabae Scop. % 91 bulunus orani ile baskin tür olarak belirlenmis , Myzus persicae Sulz. ise toplam yaprakbiti populasyonunun ancak % 9 ‘ unu olusturmustur. Yaprakbiti populasyonu hemen bütün parsellerde bitkilerin 7-8 yaprakli oldugu Haziran basinda baslayip , yaprak sayisinin maksimuma (15-20 yaprakli dönem) ulastigi Temmuz ortasinda en yüksek noktaya çikmistir. Populasyon , yüksek sicakliklarin basladigi Agustos basinda iyice azalip , Agustos ortasinda tamamen yok olmustur. Iki sekerpancari çesidinden S-814 , A. fabae tarafindan daha çok tercih edilmektedir (P < 0,01). A. fabae ve toplam yaprakbiti populasyonu artan azot dozlarina paralel olarak yükselmektedir (P<0,05). Toplam afit populasyonu 229,67 + 16,65 birey/bitki ile S – 814 çesidi ve 35 kg/da dozunda en yüksek, 55 + 10,58 birey/bitki ile Eureka çesidi kontrol parselinde en düsük olmustur. Çok etkin bir virus vektörü olan M. persicae sayisinda ise muhtemelen düsük populasyonuna bagli olarak çesitler arasi farklilik önemsiz iken azot dozlari bakimindan ise sadece hiç azot verilmeyen kontrol parseli ile en yüksek azot dozu verilen parsel arasindaki farklilik önemli bulunmustur (P<0,05). Sonuç olarak , sekerpancarinda yaprakbiti populasyonunun sinirlanmasi bakimindan yetistiricilere 15-20 kg/da dozunun üstünde azotlu gübre kullanilmamasi tavsiye edilmelidir.

Population developments of aphid species on two sugar beet varieties, Eureka (monogerm) and S-814 (triploid), fertilized with four different nitrogen doses (0, 15, 25, 35 kg/da) were surveyed in Altinekin – Konya province of Turkey. The experiment was completely randomized design with three replications. The survey revealed that the sugar beet varieties were harbored only two aphid species under given experimental conditions. The most common species was Aphis fabae Scop. with a relative frequency of 91%, while Myzus persicae Sulz. was relatively less abundant (9%) in the sampled areas. In almost all plots, the first aphid occurrence was observed at the beginning of June, which coincides with 7-8 leaf stages of sugar beet varieties. The aphid populations peaked around mid July when the leaf number was maximum (15-20 leaf stage) for sugar beet. Then the populations gradually declined until the beginning of August probably due to increase in air temperature, and completely collapsed by mid August. The abundance of A. fabae on variety S-814 was more than that of Eureka (P<0,01). Both A. fabae and total aphid population were parallely increased with increasing nitrogen doses (P<0,05). The highest number of aphid (229,67 + 16,65 aphid/plant) was found on variety S – 814 fertilized at 35 kg/da rate, whereas variety Eureka on control plots harbored the lowest number of aphids (55 + 10,58 aphid/plant). For M. persicae, an effective virus vector, while the differences between varieties were not significant, only the difference between unfertilized and highest nitrogen dose were statistically important (P<0,05). Overall, due to aphid tendency toward nitrogen rich plots, fertilization over 15-20 kg nitrogen/da was not suggested to control aphid population growth in sugar beet fields.