Temperature and the life cycle heterodera schachtII (nematoda:heteroderidae)
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منابع مشابه
Temperature and the Life Cycle of Heterodera Schachtii (nematoda: Heteroderidae)
Development of the sugar beet cyst nematode, Heterodera schachtii, was studied in growth chambers at 20, 25, 29, 32 and 35 ± 1 oC on Beta vulgaris cv. Saccharifera. The optimum temperature for reproduction appeared to be 32 oC, at which the life cycle, from second-stage juvenile (J2) to J2, was completed in 16-19 days; at 35 oC, 20-21 days were required. Juveniles emerged from eggs within 29 da...
متن کاملThe Relationship Between Population Density of Heterodera schachtii, Soil Temperature, and Sugarbeet Yields.
In two glasshouse experiments, relations between sugarbeet root dry weight (y, expressed as a percentage of the maximum dry root weight), and preplanting populations of Heterodera schachtii (P(i)) were described by the equation y = 100(Z)(P(i)-T), in which Z = a constant slightly smaller than 1, and T = the tolerance limit (the value of P(i) below which damage was not measureable). T varied wit...
متن کاملHost Suitability of Rapeseed for Heterodera schachtii.
Because rapeseed, especially canola, has the potential to be grown in rotation with sugarbeet in the north-central region of the United States, this study was initiated to assess its susceptibility to infection by Heterodera schachtii and to develop a screening method for Brassica germplasm. Existing methodology was adapted for growing Brassica juncea, B. napus, B. rapa, Brassica hybrids, and s...
متن کاملPathological Differences in Heterodera schachtii Populations.
Five populations of Heterodera schachtii Schm. from Oregon, Idaho, and Utah did not differ significantly in seedling penetration and rate of emergence and virulence. Another Utah H. schachtii population (Utah 2), however, differed from these five populations in all of the above-mentioned characteristics. More H. schachtii larvae of the Utah 2 population than the other populations penetrated sug...
متن کاملThe 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...
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ژورنال
عنوان ژورنال: Communications Faculty of Science University of Ankara Series C Biology Geological Engineering and Geophysical Engineering
سال: 2011
ISSN: 1303-6025
DOI: 10.1501/commuc_0000000178