منابع مشابه
Characterization of Heterodera zeae Populations from Portugal.
Three populations of the corn cyst nematode Heterodera zeae, one found in the rhizosphere of a fig tree and two infecting corn, were studied using the morphology and morphometry of cysts and second-stage juveniles, and compared with other populations. The intrapopulation and intraspecific variability are discussed. A simple and improved technique to prepare vulval cones for SEM is described. Th...
متن کاملFactors Influencing Emergence of Juveniles from Cysts of Heterodera zeae.
Several factors were studied to determine their effects on hatch and emergence of second-stage juveniles (J2) from cysts of Heterodera zeae. The optimum temperature for emergence of J2 from cysts of H. zeae was 30 C. No juveniles emerged from cysts at 10 or 40 C. Immersion of cysts in 4 mM zinc chloride solution stimulated 10% greater emergence of J2 than occurred in tap water controls during 2...
متن کاملThe Probable Spreading and Risk Assessment of the Corn Cyst Nematodes Heterodera zeae and Punctodera chalcoensis on Maize in Belgium and the Netherlands
The corn cyst nematode Heterodera zeae [1], was first detected on the roots of maize collected from Rajasthan, India [1-3]. The pest has subsequently been reported to be present in Pakistan [35], Thailand [2,6], Egypt [7], Greece [8]. Portugal [9] and Virginia and Maryland in the USA [2,10,11] Heterodera zeae is restricted to warmer tropical and sub-tropical areas. And its distribution can be s...
متن کاملLife Cycle of Heterodera zeae Koshy, Swarup, and Sethi on Zea mays L. Axenic Root Explants.
Monoxenic cultures of Heterodera zeae, the corn cyst nematode (CCN), were established on root explants of corn Zea mays L., cv. Kenworthy. The life cycle of H. zeae was determined from light anti scanning electron microscopic observations of the root explants grown in the dark at 29.5 +/- .5 C under gnotobiotic conditions. The life cycle, from the time the explants were inoculated with second-s...
متن کاملSterol Composition of the Corn Cyst Nematode, Heterodera zeae, and Corn Roots.
Sterols from free sterol and steryl ester fractions from Heterodera zeae and from total lipids of Zea mays roots were analyzed by gas-liquid chromatography (GLC) and by GLC-mass spectrometry. The major free sterols of H. zeae were 24-ethylcholesterol (54.4% of total free sterol), 24-ethylcholesta-5,22-dien-3beta-ol (13.3%), 24-methylcholesterol (12.5%), and cholesterol (7.2%). The same four ste...
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ژورنال
عنوان ژورنال: Nematological Research (Japanese Journal of Nematology)
سال: 1994
ISSN: 0919-6765,1882-3408
DOI: 10.3725/jjn1993.24.1_35