The Effect of Different Nitrogen Doses in Two Sugar Beet Varieties on Population Development of Aphids (Homoptera:Aphidoieda)

Authors : Duran CİHAN, Meryem UYSAL ELMALI

Pages : 79-85

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Publication Date : 2003-12-25

Article Type : Research Paper

Abstract :Population developments of aphid species on two sugar beet varieties, Eureka insert ignore into journalissuearticles values(monogerm); and S-814 insert ignore into journalissuearticles values(triploid);, fertilized with four different nitrogen doses insert ignore into journalissuearticles values(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 insert ignore into journalissuearticles values(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 insert ignore into journalissuearticles values(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 insert ignore into journalissuearticles values(P<0,01);. Both A. fabae and total aphid population were parallely increased with increasing nitrogen doses insert ignore into journalissuearticles values(P<0,05);. The highest number of aphid insert ignore into journalissuearticles values(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 insert ignore into journalissuearticles values(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 insert ignore into journalissuearticles values(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.
Keywords : Sekerpancari çesitleri, Aphis fabae, Myzus persicae, azot dozlari, populasyon gelisimi, Türkiye