Effects of Host Variety, Photoperiod and Chemical Treatments on Hatching of Globodera rostochiensis.
Golden nematode cysts were collected after they had completed one generation on an early, a mid-season, or a late-maturing potato variety ('Superior,' 'Katahdin,' and 'Sebago,' respectively). The plants were grown in 8.5- or 16-h photoperiods and treated with gibberellic acid (GA) or xylocaine or both. When treated subsequently with potato root-diffusate few (13.3%) juveniles hatched from cysts collected from Sehago, more (22.3%) from cysts collected from Katahdin, and most (36.0%) from cysts collected from Superior. Hatching was greater from cysts collected from plants treated with GA than from untreated plants. Short photoperiods decreased hatching from cysts collected from Katahdin but increased hatching from cysts collected from Superior and Sebago. Gibberellic acid had no detectable effect on hatching, but EDTA had some.
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