Browsing by Author "Kulaz, H"

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Effect of Cultivars and Insecticides on Sitonid Weevil, Sitona Crinitus (Coleoptera: Curculionidae), and on Yield, Yield Components and Nodulation of Lentil (Lens Culinaris)
(indian Counc Agricultural Res, 2005) Erman, M; Yardim, EN; Kulaz, H
An experiment was conducted during 2001 and 2002 to determine the effectiveness of different insecticides against sitonid weevil [Sitona crinitus (Herbst.)] (Coleoptera : Curculionidae) on 2 cultivars ('Sazak 91' and 'Yerli Kirmizi') of lentil (Lens culinaris Medikus). Yield, yield components and number of nodules fed by larvae were compared between the 2 cultivars as well as among insecticide treatments. Insecticides applied were chlorpyriphos (720 g ai/ha), malathion (1 300 g ai/ha) and a systemic insecticide, oxydemeton methyl (265 g ai/ha). Application of oxydemeton methyl decreased the damage on nodules by 52.6 and 41.2% in 2001 and 2002, respectively, resulting in seed yield increase (729 and 1 461.6 kg/ha in 2001 and 2002), biological yield (1 825.5 kg/ha and 3 521.6 kg/ha), pods/plant (23.8 and 25.7), 1 000-seed weight (47.7 and 48.4 g), plant height (26.1 cm and 30.0 cm), branches/plant (7.3 and 8.9), root dry weight/plant (0.136 g and 0.106 g) and shoot dry weight/plant (0.859 g and 1.056 g) over the control treatment. 'Yerli Kirmizi' cultivar showed less nodules fed (0:8 and 1.9 respectively) by the sitonid pest and gave higher seed yield (712.6 and 1 393.3 kg/ha than 'Sazak 91 (537.4 and 1 301.3 kg/ha) in 2001 and 2002 respectively.
Integration of Weeds Into Pest Management in Alfalfa Agroecosystems
(British Crop Protection Council, 2000) Yardim, EN; Kulaz, H; Özgen, I
Weeds are often major limiting factors in crop production and they are eliminated through various control measures in modern agricultural systems. However, weeds can increase diversity and contribute to the stability of agroecosystems. They can also modify pest incidences by providing alternative hosts for pests and food sources, shelter and habitat for natural enemies. Because of their ecological aspects, weeds, when managed properly, could play an important role in pest management in organic farming systems. In this study, we assessed the effects of weeds on the incidences of alfalfa weevil, Hypera variabilis Hbst. (Coleoptera: Curculionidae), arthropod predators and forage yield in replicated weedy and weed-free plots in 1998 and 1999. The pest populations were sampled throughout the season using a sweep-net. Yield data were obtained using a I m(2) quadrate. The results showed that the weevil numbers were 20% higher in the weed-free plots than in the weedy plots in 1998. Arthropod predators were more abundant in the weedy plots. Forage yield was 14% and 16% higher in the weed-free plots than in the weedy plots in 1998 and 1999, respectively.
Use of Fertility as a Cultural Practice in Pest Management in Alfalfa
(British Crop Protection Council, 2000) Yardim, EN; Kulaz, H; Ozgen, I
Using different fertility sources, we evaluated the effects of these inputs on the incidences of alfalfa weevil, Hypera variabilis Hbst.(Coleoptera: Curculionidae), predatory arthropods and yield in replicated alfalfa plots in 1998 and 1999. The fertility treatments included: (i) use of inorganic fertilizers, (ii) animal manure, (iii) dried manure ash, commonly used as a plant nutrient source in the Eastern Anatolia and (iv) no added fertility control. The results showed that the weevil populations were higher in the inorganic fertilizer and the animal manure treated plots than those in the control plots both in 1998 and 1999. Dried manure ash did not have any considerable effects on the weevil populations. Yield was higher in the control plots in 1998 and in the dried manure ash treated plots in 1999 than in the other fertility treatment plots.