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Table 3 – Efficacy of different treatment against apple scab on fruits (Scale OEPP/EPPO)
Treatments
%
no attack
Assessment
20/07/00
% Fruits with
1-3 spots
109
% Fruits with
more than 3
spots
%
no attack
Assessment
18/08/00
% Fruits with
1-3 spots
% Fruits with
more than 3 spots
Copper oxycloride 61.7 eD 26.2 aAB 9.6 aA 70.1 cD 18.9 aA 4.9 aA
Copper oxycloride,
Copper sulfate
hydrate
38.0 dC 39.0 cB 27.8 bB 55.3 bC 28.6 bAB 17.6 abABC
Copper hydroxide 58.5 eD 28.7 abAB 11.7 aA 69.0 cD 19.6 aA 6.9 aAB
Copper metal with B,
Mo, Zn
27.6 cBC 38.2 bcB 38.8 cB 48.8 bBC 33.0 bB 21.0 bcABC
Calcium polysulphide 24.7 bcB 37.8 bcB 41.7 cBC 46.5 bBC 32.5 bB 24.3 bcBC
Sulphureous
clay, leavening
substances,equisetum
extracts
18.1 bB 27.1 aAB 56.3 dCD 36.2 aAB 35.6 bB 32.6 cCD
Control 6.1 aA 20.2 aA 68.2 eE 29.2 aA 28.3 bAB 46.1 dD
Different letters indicate significant different values by Duncan test (for P=0,05, lower-case letters, and for
P=0,01 capital letters)
Conclusions
By the results obtained in the operating conditions of the trial, we can deduce that the various formulates have
against apple scab an acceptable activity related to the degree of attack found in the control parcels. Best results
have been obtained with copper oxicloride, reference product in our trials, and also copper hydroxicloride;
second best results were obtained with the use of Cuprobenton (copper compounds and active bentonites).
Calcium polysulphide has given partial protection, however, it is a positive result because its employment, also
after grown resumption, is permitted by Reg. CE n. 1073/2000. Cuivrol, constituted from oligoelements B, Cu,
Mo, Zn and Myco-sin, made up of sulphureous clay were less effective. Activity against apple scab, not always
satisfactory, manifested by several products, could in part be related to the strong pressure of the pathogen that
has found favourable climatic conditions for the insurgence and spread of the disease.
References
− Boschieri S., Mantinger H.,1991. Produzione biologico-organica del melo presso il centro per la
sperimentazione di Laimburg. Otto anni di esperienze. L’informatore Agrario, 44: 97-101.
− C.M.I. Descriptions of Pathogenic Fungi and Bacteria No.401,1974, Kew.
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