Volume 13, Number 4 Search All Journals Search for: Back to Issue Occurrence of the alfalfa mosaic virus in sugar beet in Califor View Article PDF Back to Issue Post navigation Resistance to the sugar beet nematode (Heterodera schachtii) in F tetraploid hybrids between Beta vulgaris and Beta patellarisOn the nature of hatching of Heterodera Schachtii. II. Natural sources of hatching stimulants