Control of crown rot (Phytophthora cactorum) of apple trees with the systemic fungicides metalaxyl and fosetyl-aluminium

1987 ◽  
Vol 19 (4) ◽  
pp. 289-295 ◽  
Author(s):  
Rajeshwar S. Utkhede
Keyword(s):  
Crown Rot ◽  
Phytophthora Cactorum ◽  
Apple Trees ◽  
Systemic Fungicides

scholarly journals Response to Artificial Infection by Phytophthora cactorum of Four Apple Scion Cultivars on Three Rootstock

HortScience ◽  
1993 ◽  
Vol 28 (7) ◽  
pp. 717-718 ◽  
Author(s):  
R.S. Utkhede ◽  
E.M. Smith
Keyword(s):  
Field Experiment ◽  
Malus Domestica ◽  
Crown Rot ◽  
Phytophthora Cactorum ◽  
Artificial Infection ◽  
Apple Trees ◽  
Golden Delicious ◽  
Scion Cultivar

A 10-year field experiment was conducted on 20-year-old apple trees (Malus domestica Borkh.) inoculated with Phytophthora cactorum (Leb. & Cohn) Schroet. to study the influence of the scion cultivar on rootstock susceptibility. The rootstock MM.111 was less susceptible to P. cactorum than M.7 when `Golden Delicious' was the scion, but there were no differences when `Delicious', `Haroldred Delicious', or `McIntosh' were the scions. Similarly, the rootstock M.26 was less susceptible than M.7 when `McIntosh' was the scion, but there were no differences when `Delicious', `Haroldred Delicious', or `Golden Delicious' were the scions. These results suggest that the influence of scions on rootstock susceptibility to P. cactorum crown rot is variable.

scholarly journals First report of crown rot of Photinia fraseri caused by Phytophthora cactorum

2006 ◽  
Vol 55 (4) ◽  
pp. 573-573 ◽  
Author(s):  
A. M. Vettraino ◽  
L. Antonacci ◽  
L. Flamini ◽  
P. Nipoti ◽  
E. Rossini ◽  
...  
Keyword(s):  
Crown Rot ◽  
Phytophthora Cactorum ◽  
First Report

STUDIES OF CROWN ROT OF APPLE TREES

1942 ◽  
Vol 20c (9) ◽  
pp. 457-490 ◽  
Author(s):  
Maurice F. Welsh
Keyword(s):  
Soil Moisture ◽  
Apple Tree ◽  
Disease Incidence ◽  
Antagonistic Effect ◽  
Crown Rot ◽  
Phytophthora Cactorum ◽  
Additional Information ◽  
Two Factors ◽  
Below Ground ◽  
Old Trees

The form of apple tree crown rot that occurs in the irrigated orchards of British Columbia is confined to the below-ground bark tissues of the tree. It has been encountered in trees of all ages and of all the commercial varieties.Proof is given that this crown rot is caused by the fungus Phytophthora cactorum (L. & C.) Schroet. Typical symptoms of the disease have been reproduced in over 200 trees of various ages as a result of their inoculation with this fungus. Isolation has been possible only from the margins of active lesions, and has proved difficult even from these tissues. There is evidence that the activity of P. cactorum is inhibited in rotted tissues by the antagonistic effect of one or more secondary organisms.The influence of soil moisture and temperature on disease incidence has been studied by field observations and by the inoculation of two-year—old trees under controlled conditions in Wisconsin tank equipment in the greenhouse. The effects of these two factors seem to be interrelated, with the highest incidence of disease in an almost saturated soil at the highest temperature imposed, 32 °C. The influence of soil moisture is exerted particularly in the subsoil, rather than in the locus of crown rot attack.Certain varieties of apple have been found to vary in their resistance to crown rot. Deep wounds have proved necessary to allow entry of the fungus into bark tissues.The additional information now available is being utilized in a search for improved means of combating the disease.

scholarly journals Meristem culture for the elimination of the strawberry crown rot pathogen Phytophthora cactorum

2011 ◽  
Vol 1 (3) ◽  
pp. 129-136 ◽  
Author(s):  
A.B. Whitehouse ◽  
C.L. Govan ◽  
K.J. Hammond ◽  
D.J. Sargent ◽  
D.W. Simpson
Keyword(s):  
Crown Rot ◽  
Meristem Culture ◽  
Phytophthora Cactorum

scholarly journals First Notice of Phytophthora Aerial Blight and Crown Rot on Pansies in Poland

2010 ◽  
Vol 50 (2) ◽  
pp. 233-237 ◽  
Author(s):  
Leszek Orlikowski ◽  
Magdalena Pļaszek ◽  
Adam Wojdyļa ◽  
Czesļaw Skrzypczak
Keyword(s):  
Botrytis Cinerea ◽  
Malus Domestica ◽  
Pythium Ultimum ◽  
Crown Rot ◽  
Fusarium Avenaceum ◽  
Phytophthora Cactorum ◽  
Disease Symptoms ◽  
Necrotic Spots ◽  
Begonia Semperflorens

First Notice ofPhytophthoraAerial Blight and Crown Rot on Pansies in PolandPhytophthora cactorumwas detected on &9/10; of pansies showing yellowing of leaves and crown rot symptoms and constituted about 90% of isolates obtained.Botrytis cinerea, Fusarium avenaceum, F. solaniandPythium ultimumwere also isolated from diseased tissues. Using rhododendron leaves as the bait,P. cactorumwas detected in pansy substratum as well as from soil under the mata. Isolates obtained from diseased plants, substratum and soil under mata colonized leaves, stem parts and roots of pansy. Necroses spread faster on organs inoculated with cultures from plants and substratum. Among 25 cultivars inoculated withP. cactorum, disease symptoms did not occur on 3 of them, whereas the fastest spread of necrotic spots (3.8 mm/24 hrs) was noticed on 3 cultivars. Isolates ofP. cactorumfromBegonia semperflorensandMalus domesticacolonized leaf petioles of pansy with significantly faster spread when isolates from begonia and pansy were used for inoculation.

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