California Pest Rating Proposal for Heterodera carotae Jones, 1950 Pest Rating: B   PEST RATING PROFILE Initiating Event: None. History & Status: Background:  Prior to the discovery of the carrot cyst nematode, “carrot-sickness” was believed to be caused by pathogenic fungi.  However, in 1931, when all cyst-forming nematodes were considered strains of H. schachtii (sugarbeet … Continue reading Heterodera carotae Jones, 1950 →