Premium
The relationship between numbers of Heterodera schachtii and sugar beet yields on a mineral soil, 1978‐81
Author(s) -
COOKE D. A.
Publication year - 1984
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.1744-7348.1984.tb05594.x
Subject(s) - heterodera schachtii , sugar beet , biology , soil water , agronomy , population , yield (engineering) , horticulture , ecology , metallurgy , materials science , demography , sociology
SUMMARY In a 4‐yr field experiment on a mineral soil infested with beet cyst nematode ( Heterodera schachtii ) the relationship between root yield of sugar beet ( y ) and initial population of H. schachtii (P i ) fitted the equation: y = y min + (y max ‐ y min) Z Pi‐Ty min = 7·7 t/ha, y max = 39·4 t/ha, 2 = 0·99938 and T= 0 eggs/100 g soil. From this information and that obtained during a recent survey of 2766 beet fields, the total national root yield loss caused by H. schachtii was estimated as approximately 10 000 t/annum on mineral soils and (assuming a similar yield loss relationship on all soil types) 30 000 t/annum on organic soils. No consistent differences in efficiency of extracting cysts were found between the Fenwick Can and the flotation column. A bioassay technique was as effective as cyst extraction techniques in identifying infested soils.