ISHS Acta Horticulturae 297: II International Symposium on Kiwifruit
DISTRIBUTION OF PLANT-PARASITIC NEMATODES IN THE RHIZOSPHERE OF KIWIFRUIT |
| Authors: | R.N. Watson, E.A. Wilson, R.S. Marsden |
| Keywords: | herbicide strip, nematode seasonality |
| Abstract:
The root systems of single, six-year-old kiwifruit plants were sampled at four weekly intervals between August 1987 and July 1988. Sixteen soil cores 5 cm diam. were taken through the root system to 1 m depth for each plant and divided into 20 cm fractions for extraction of roots and nematodes. Root knot nematode (Meloidogyne hapla) was the only plant-pathogenic genus found throughout the root system and to have a strong association with the presence of kiwifruit roots in samples. Helicotylenchus, Heterodera, Pratylenchus, Paratylenchus, Tylenchus and Paratrichodorus occurred in low numbers and generally predominated within the grassy strip between kiwifruit rows. Minor genera were therefore largely and in some cases exclusively associated with the roots of weeds. The grassy zone, which included plant species favourable for Meloidogyne hapla such as white clover, did not enhance soil populations of this nematode when compared with the herbicide treated zone. The distribution of root knot nematode in the kiwifruit rhizosphere has implications for the development of effective sampling and control strategies. | |
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