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Original scientific paper

The Biology and Ecology of the Quarantine Species Globodera rostochiensis (Wollenweber, 1923) Behrens, 1975 (Nematoda: Heteroderidae) in Međimurje County

Dinka GRUBIŠIĆ orcid id ; Department for Agricultural Zoology, Faculty of Agriculture, University of Zagreb, Zagreb, Croatia
Ljerka OŠTREC ; Department for Agricultural Zoology, Faculty of Agriculture, University of Zagreb, Zagreb, Croatia
Tanja GOTLIN ČULJAK ; Department for Agricultural Zoology, Faculty of Agriculture, University of Zagreb, Zagreb, Croatia
Marija IVEZIĆ ; Department for Plant Protection, Faculty of Agriculture, University J. J. Strossmayer in Osijek, Croatia
Bruno NOVAK ; Zavod za povrćarstvo, Agronomski fakultet Sveučilišta u Zagrebu, Zagreb, Hrvatska

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The quarantine species of nematode Globodera rostochiensis (Wollenweber, 1923) Behrens 1975 is one of the most important pests of potato in the world. It is possible to keep the population of this species below the threshold of economic damage only with integrated plant protection, including the use of rotation, planting cultivars that are resistant to the nematode, carrying out the trap
cropping method, solarisation and chemical control. It is important to know the biology and ecology of this species for the sake of timely implementation of the trap cropping measure, the choice of appropriate cultivars and the application of nematicides. Research into the biology and ecology of G. rostochiensis was carried out from 2003 to 2005 in field trials set up in the Belica site, monitoring
the appearance and development of the individual stages of development of this species in and on the roots of the cultivars Kondor and Desiree, which are susceptible to this pest. The first infectious larvae (L2) were established in potato root 20 days (2004), 22 days (2003) and 23 days (2005) after planting (from the first to the second decade of May), while the maximum number of larvae in the roots was determined on 32 days (2004), 34 days (2003) and
43 days (2004) after planting (i.e., in the second decade of May and the first decade of June). The first sexual stages were determined in and on the root of the potato at the earliest 34 days (2003), 46 days (2004) and 50 days (2005) after the planting of potatoes (the second decade of May and the first and second decades of June). On the basis of familiarity with the period of the first entry of the larvae into the root, the maximum penetration (abundance) of the larvae in the root and the appearance of the first sexual stages, it is possible to determine the date to conduct the trap cropping method, removing
the young shoots of the potato before the maximum larval invasion, around a week after the first penetration by larvae (29 days after planting). The different developmental phases of this species (larvae and adult forms) are present in and on the root until the young shoots wither, to before the end of the first decade of September, which has a deleterious effect on the amount of the yield
harvested in conjunction with parasitism from this species. The species G. rostochiensis in the said cultivation area has one generation a year. The length of the life cycle in the site of Belica has been recorded at 59 days (82 days after planting in 2005), or 66 days (86 days after planting in 2004). Differences in the appearance of the individual development phases are the consequences of
varied climatic conditions in the individual years of the research programme.


Globodera rostochiensis, trap cropping, biology and ecology

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