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Effects of potato genotype, oxamyl and the numbers of potato cyst‐nematodes, Globodera rostochiensis or G. pallida on tuber yields and nematode increase
Author(s) -
WHITEHEAD A. G.,
TITE D. J.,
FRASER JANET E.,
NICHOLS A. J. F.
Publication year - 1987
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1987.tb01443.x
Subject(s) - oxamyl , globodera rostochiensis , biology , seedbed , globodera pallida , agronomy , potato cyst nematode , sowing , cultivar , crown (dentistry) , piper , rotylenchulus reniformis , horticulture , nematode , solanaceae , botany , pesticide , ecology , meloidogyne incognita , medicine , biochemistry , dentistry , gene
SUMMARY A new technique is described for establishing different numbers of the potato cyst‐nematode Globodera rostochiensis in field soil, which leaves the soil homogeneous in nutrient status. Field plots established in this way were used to compare yield losses in four potato cultivars (Maris Piper, Pentland Crown, Pentland Dell and Désirée) associated with different numbers of G. rostochiensis. Over the range of 7.4 to 148.4 eggs g ‐1 soil at planting, yield losses were 18.7% (Maris Piper), 53.2% (Désirée), 55.7% (Pentland Crown) and 63.5% (Pentland Dell). Similar results were obtained in another experiment on the same field in a different year using only lightly and heavily infested plots. Treating the seedbed soil with oxamyl before planting prevented significant injury to potatoes by G. rostochiensis but increased the yield of Pentland Dell and perhaps Désirée (but not Maris Piper or Pentland Crown) more than expected from nematode control alone. Treating heavily infested soil with such a nematicide cannot therefore be recommended as part of a valid procedure for establishing lightly and heavily infested plots for comparing tolerances of attack by potato cyst‐nematodes in a range of potato genotypes. In peaty loam soils moderately or heavily infested with G. pallida , oxamyl at 5.6 kg a.i. ha ‐1 incorporated into the seedbed before potatoes were planted generally increased tuber yields, though the effects varied considerably with the cultivar grown. Increase of G. pallida in these soils was controlled better by growing potatoes bred for resistance to it (ZB 35 – 29, Caxton, Santé, Morag, 11233 ab 22, Fingal, A27/23, Cromwell). Increase of G. pallida on susceptible cultivars varied greatly and Romano increased G. pallida no more than the resistant Morag. G. pallida is probably controlled best in peaty loam by growing a resistant cultivar in soil treated with a granular (non‐fumigant) nematicide.