Emergence of juvenile potato cyst‐nematodes Globodera rostochiensis and G. pallida and the control of G. pallida

摘要: Summary Speed of emergence juveniles from cysts in potato root diffusate (PRD) vitro differed between Globodera rostochiensis and G. pallida populations within each species. Early was slower most than rostochiensis. Fewer emerged 4 or 6 month old yr cysts. More solutions sodium metavanadate at concentrations 10-2 10-3 M PRD as many the same PRD. In plots bare fallowed sandy loam, stimulated by 10--3 metavanadate. The two C. addition benomyl 0.1 ppm (3.4 × 10--7 m). microplots, cv. Cara potatoes grown for 8 wk decreased four up to 93%. During a period PRD, more 20 per gravid female five 25 pallida. observation boxes which Desiree grown, oxamyl applied top 15 cm peaty loam soil greatly increased 1545 deep. another but not treatment appeared increase nematode 15–30 Oxamyl incorporated uninfested all three soils largely prevented migrating upwards untreated heavily infested deep. These experiments suggest that inadequate control on susceptible an oximecarbamate nematicide short persistence, such oxamyl, is primarily due slow rate juvenile pallida, with second generation upward migration deeper later growing season potential contributory factors.