Phytophthora Root and Crown Rot of Franklinia Trees | Arboriculture & Urban Forestry

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Fig. 1.
Healthy vs. infected root systems of two-year-old Franklinia.

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Table 1.
Disease incidence (wilt) in fungicide treated, uninoculated 3-year old Franklinia trees.
Treatment^{^a}
(Formulation/liter) Dead plants (No.) Dleback^{^b}
(No.)
fall 1975 spring 1976 total
Truban 25 EC
(0.7 ml) 1^{^c} 0 1 0
Nurelle (2.7 ml) 1^{^c} 0 1 0
Banrot 40W (1.0g) 0 1 1 0
Benlate 50W
(1.2 g) 5 1 6 4
Check (H₂O) 6 1 7 3
↵^a Ten trees per treatment. Fungicides applied at 1 liter fungicide solution per 7.6 liter container.
↵^b No. trees showing dieback attributed to winter damage.
↵^c Trees showed some winter damage at treatment time.
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Table 2.
Disease incidence (wilt) in fungicide treated, three-year old Franklinia trees inoculated with P. cinnamomi.
Treatment^{^a}
(Formulation/liter) Dead plants (No.) Dieback^{^b}
1976
fall 1975 spring 1976 total
Truban 25 EC (0.7 ml) 0 0 0 0
Nurelle (2.7 ml) 0 1 1 0
Banrot 40W (1.Og) 0 1 1 1
Benlate 50W (1.2 g) 6 0 6 4
Check (H₂O) 4 1 5 5
↵^a Ten trees per treatment. Fungicides applied at 1 liter fungicide solution per 7.6 liter container.
↵^b No. trees showing dieback attributed to winter damage.

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