Hello again, I reread my post and realized it could be interpreted as
over-wintering of bacteria in "symptomless" tissue. What I meant is
that once we removed obviously diseased shoots at various times during
the season, sometimes disease came back later during the year,
sometimes only the following year, sometimes never (same plot, same
cultivar, same rootstock).
It is very likely that the bacteria simply overwintered in a canker
that we did not see. In the following spring, bacteria probably moved
internally from the canker, because we saw no blossom blight.
If blighted shoots are removed during early
phases of symptom expression, one can usually eliminate the infection
by removing as little as 8 inches of shoot below the infection point,
Cool experiment sir! This is neat. We did not measure disease
resurgence at the point of cut directly. However, we did see that we
needed more numerous and deeper cuts when pruning was delayed. Some of
the extra cuts were because of the multiple passes needed.
Vincent Philion, agr., M.Sc.
Phytopathologiste
Laboratoire de production fruitière intégrée
Institut de recherche et de développement en agroenvironnement
335, Rang des vingt-cinq Est
Case postale 24
Saint-Bruno-de-Montarville (Québec) J3V 4P8
Tél. bureau: 450 653-7368 poste 224
Tél. laboratoire: 450 653-7368 poste 229
Cellulaire: 514-623-8275
Autre: 802-659-4282
Télécopie: 450 653-1927
Verger du parc national du Mont-Saint-Bruno
330, Rang des vingt-cinq Est
Case postale 24
Saint-Bruno-de-Montarville (Québec) J3V 4P8
Téléphone et télécopieur : 450 653-8375
Courriel: [email protected]
Site Internet: www.irda.qc.ca
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