The climate is warmer and more humid and, phytogeographically, its vascular plant flora contains abundantly southern • species not known on the mainland of Finland. Only a few papers have been published on the mycoflora of Ahvenanmaa (Swedish: Aland) FREY 1944, STENLID 194.7, ScHULMANN 1960). Polypores (Polyporaceae) have been observed only occa• sionally. Most of these observations have been published by STEN-LID (1947, p. 87, 27 notes of 18 species) also including some rare species. FREY (1944, p. 15~16) has given somewhat fewer observations of Polyporaceae than STEmm. In the collections of mycological herbaria of the Universities of Hel-sinki and Turku and of the Finnish Forest Research Institute, Helsinki, there are only a few samples (some dozens) of Polyporaceae from Ahvenanmaa. The author has collected polypores in the Ahvenanmaa area during the last two autums (years 1965 and 1966) in connection with his other investigations. I wish express my deep gratitude to Prof. Dr. V. Kujala who has determined the critical and difficult samples and examined the determinations made by me. I wish also to express my thanks to my fellow excursionists, Dr. V. Hintikka and Mr. M. Kaivos as well as to forest officer Bo Hognas who kindly provided information on many interesting investigation places in Ahvenanmaa. The following list of species has been arranged alphabetically. The names of the taxa follow in the main that of BoNDARTSEV (1953). Some of the names of resupinate species are after CHRISTIANSEN (1960). All specimens in the following list, which have Abortiporus borealis (Fr.) Bond. et Sing.
A Field experiment was carried out in a cocoa plantation in Brazil to evaluate whether a fungal biocontrol agent (Trichoderma spp.) and a chemical adjuvant could enhance the efficacy of cuprous oxide sprays that are applied to control witches’ broom disease. The experimental design was comprised of 16 plots containing approximately 50 mature cocoa trees each. Each plot measured approximately 1000 m2. Treatments were allocated to plots randomly. Treatments were: control (no spray), cuprous oxide, cuprous oxide plus adjuvant, and cuprous oxide plus adjuvant plus fungus. Sprays were applied monthly from April to September in line with official recommendations for the control of witches’ broom disease. Sprays were applied using a motorized backpack mistblower. Monthly assessments of disease incidence were made from March to November. Assessments were made on five randomly selected trees from 15 marked trees located in the center of each plot. Assessments were comprised of the numbers of healthy and diseased pods observed on trees, the numbers of green and necrotic axillary and terminal brooms, and the numbers of healthy and diseased pods taken from trees at each harvest. The results show that disease incidence was the highest in the control plots where the fewest healthy pods were harvested. The overall incidence of disease varied from 25 to 45% across all treatments. Statistically, the results show that there were no significant differences among treatments, including the control. No significant improvements in the efficacy of copper-based sprays were measured as a result of adding the fungus or the adjuvant to the spray. Also, no significant improvements in disease control were recorded when using cuprous oxide on its own. We concluded that copper sprays were ineffective in controlling the disease. This paper discusses our results in the light of official recommendations for the control of the disease.
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