The characteristic of qualitative structure population Heterodera schachtii Schmidt in crops spring rape
نویسندگان
چکیده
منابع مشابه
The Relationship of Heterodera schachtii Population Densities to Sugarbeet Yields.
Sugarbeet yields were contpared with field populations of Heterodera schachtii Schmidt. The correlation between sugarbeet yields and viable larvae/g of soil was negative and high, but that between sugarbeet yields and viable cysts/g of soil was lower. Sugarbeet yields were also compared with H. schachtii populations by years of rotation with a nonhost crop. The coefficients of correlation (r) b...
متن کاملEffect of Nonhost Cultivars on Heterodera schachtii Population Dynamics.
Broadcast plantings of nonhost cultivars (alfalfa, barley, bean, onion, potato, and wheat) in soil in redwood boxes (4.2 x 30 x 14 cm) infested with Heterodera schachtii reduced the initial nematode populations (P = 0.05). The reduction was greater with sugarbeets, a host, than with all other cropping treatments except onion, bean, and fallow (P = 0.05). After 80 days, when the root growth of a...
متن کاملReproduction of Heterodera schachtii Schmidt on Resistant Mustard, Radish, and Sugar Beet Cultivars.
The reproduction of a Wyoming population of Heterodera schachtii was determined for resistant trap crop radish (Raphanus sativus) and mustard (Sinapis alba) cultivars, and resistant and susceptible sugar beet (Beta vulgaris) cultivars in a greenhouse (21 degrees C/16 degrees C) and a growth chamber study (25 degrees C). Oil radish cultivars also were field tested in 2000 and 2001. In the greenh...
متن کاملارزیابی مقاومت توده های مختلف چغندرقند نسبت به نماتد سیست چغندرقند (Schmidt (Heterodera schachtii
در این تحقیق تعداد 30 توده اصلاحی جدید چغندرقند حاصل از تلاقی لاین های نرعقیم منوژرم و مولتی ژرم چغندرقند با دو منبع مقاوم 1009-W (حامل ژن مقاومت از منبع Beta procumbens ) و 1010-W (حامل ژنهای مقاومت از منبع (Beta maritima در سال های 1384 و 1385 به همراه شاهدهای مقاوم و حساس در قالب طرح بلوک های کامل تصادفی با چهار تکرار در دو منطقه با آلودگی طبیعی(مشهد و خوی) از نظر مقاومت به نماتد و عملکرد ...
متن کاملthe role of thematic structure in comprehending spoken language
in fact this study is concerned with the relationship between the variation in thematice structure and the comprehension of spoken language. so the study focused on the following questions: 1. is there any relationship between thematic structure and the comprehension of spoken language? 2. which of the themes would have greated thematic force and be easier for the subjects to comprehend? accord...
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ژورنال
عنوان ژورنال: Interdepartmental Thematic Scientific Collection of Plant Protection and Quarantine
سال: 2016
ISSN: 1606-9773
DOI: 10.36495/1606-9773.2016.62.58-63