ISSN:
1573-8469
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Description / Table of Contents:
Summary The cereal root eelworm has become a serious pest in oats in some parts of the Netherlands, especially on light, sandy soils. In March and April 1955 1400 soil samples were collected from farms where the occurrence of the nematode was to be expected. In two different areas the degree of infestation was 78 and 96% of the total of fields under investigation. These figures indicate that the concerning farms were generally infested, but they do not represent the mean situation of the area. During the growing season each oat crop was examined for symptoms of the disease. The data collected were compared afterwards with the degree of infestation. There proved to be a positive correlation between the degree of infestation of the soil and the damage to the crop (tables 1 en 2). Several circumstances influence this correlation, among which the water supply of the plants seems to be a very important one. Cyst populations were identified by morphological characters to separate them from the clover root eelworm,Heterodera trifolii (Goffart, 1936), which was also present in 6,5% of the samples in one, and in 32% of the samples in the other area. The larvae in the cysts ofH. avenae evidently do not stand dry preservation, which is in accordance with recent experience in England (2). Dry preservation inplastic cavity slides for 1–3 weeks resulted in a decrease of viable cysts and larvae of 52%. A more suitable technique for collecting and handlingH. avenae in studied for further work.
Notes:
Samenvatting Op vele bedrijven, waar een sterke rotatie van granen in het bouwplan is opgenomen, kan het havercystenaaltjes veelvuldig moeheidsverschijnselen in haver veroorzaken. Ook op bedrijven, waar dit gewas geen afwijkingen in de groei vertoont, komt het aaltje, zij het in geringe concentraties, algemeen voor. Tussen de besmettingsgraad van de grond en de schade aan het gewas bestaat een zeker verband. Dit verbank kan sterk beïnvloed worden door verschillende bijkomende factoren, waaronder de watervoorziening van der planten een belangrijke rol speelt. Het is nog niet duidelijk in hoeverre de techniek van het grondmonsteronderzoek gewijzigd dient te worden om te voorkomen, dat de levende inhoud van de cysten terugloopt.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01981834
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