Fungicides and biotechnical agents in the protection of heathers against Pestalotiopsis sydowiana and their influence on plant growth
Adam T. Wojdyła | Magdalena Ptaszek | Anna Jarecka-Boncela
In the protection of heathers against shoot dieback caused by Pestalotiopsis sydowiana, the highest percentage effectiveness of 92.6% to 100% was found on plants sprayed 12 times every 7 days with the active substances: iprodione, pyraclostrobin + boscalid and trifloxystrobin and with the biotechnical agents containing: microcrystalline chitosan and extract from grapefruit seed and pulp, with an efficacy of 76.9% to 100%. The active substances like chlorothalonil, fluopyram + trifloxystrobin, iprodione, pyraclostrobin + boscalid, as well as microcrystalline chitosan and extract from grapefruit seed and pulp also stimulated plant growth. Heather plants sprayed with these agents and also those sprayed with cyprodinil + fludioxonil, trifloxystrobin and potassium carbonate + monopotassium phosphate were found to produce the highest number of new shoots. An increase in the fresh weight of the aboveground parts of the heather plants of more than 55.7% compared with the control plants was found after spraying the plants with the active substances such as: fluopyram + trifloxystrobin, iprodione, pyraclostrobin + boscalid, cyprodinil + fludioxonil, trifloxystrobin and with the biotechnological agents containing microcrystalline chitosan extract from grapefruit seed and pulp, and potassium carbonate + monopotassium phosphate. Similarly, the highest average dry weight of the aboveground parts was found after the application of these agents.
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