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AGRICULTURAE
CONSPECTUS SCIENTIFICUS
Volume 65, No 2, 2000 (61-69)
ORIGINAL SCIENTIFIC
PAPER
The Effect of Flue-cured Tobacco Monoculture and Different Types of
Crop Rotations on Population Densities of Plant-parasitic Nematodes
Andelko BUTORAC 1
Ljerka OSTREC 1
Ivan TURSIC 2
Ferdo BASIC 1
Nikola VULETIC 2
Jasminka BUTORAC 1
Ivica KISIC 1*
Milan MESIC 1
Marijan BERDIN 2
SUMMARY
Phytosanitary
function of crop rotation is a known fact, so one of the basic motives
for this work was to investigate its influence on the population densities
of plant-parasitic nematodes. Long-term experiments, which are still in
progress, were set up on luvic semigley on multi-layered Pleistocene sands
on the experimental field of the Tobacco Institute Zagreb at Pitomača.
Along with tobacco monoculture, investigations also included seven different
types of crop rotations. As key crop, tobacco is included in all crop
rotations. Results obtained indicate that presence of the population of
endoparasitic nematodes, genus Pratylenchus, was to some degree
crop dependent. Tobacco does not seem to stimulate intensive occurrence
of this nematode population. However, as soon as it is included into crop
rotation, the number of nematodes increases particularly in crop rotations
involving a larger number of rotation fields. Soybean and oil-seed rape
favour the spread of Pratylenchus species. Still, no alarming incidence
of nematodes belonging to this genus was recorded. Ectoparasitic nematodes
involve genera Tylenchus, Tylenchorhynchus and, to some
extent, Paratylenchus, while incidence of genera Helicotylenchus
and Rotylenchus is negligible. Members of these genera are no dangerous
pests for the crops studied, even more so as they mainly appeared in populations
that are not noxious. The established opinion about the population of
saprophagous nematodes being more dependent on the amount of soil organic
matter than on the crop type was not convincingly confirmed in this research.
KEY WORDS
Crop rotations,
plant-parasitic nematodes, tobacco monoculture
1 Faculty of Agriculture, University of Zagreb
Svetošimunska cesta 25, 10000 Zagreb, Croatia
*E-mail: ikisic@agr.hr
2 Tobacco Institute Zagreb, Planinska 1, 10 000 Zagreb, Croatia
Received: September 21, 1999
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