Management of ripe rot by fungicides in commercial blueberry plantations | Gatavo ogu puves ierobežošanas iespējas krūmmelleņu komercstādījumos
2011
Volkova, J., Latvian Plant Protection Research Centre, Riga (Latvia) | Bazenova, A., Latvian Plant Protection Research Centre, Riga (Latvia) | Rancane, R., Latvian Plant Protection Research Centre, Riga (Latvia) | Vilka, L., Latvian Plant Protection Research Centre, Riga (Latvia)
Blueberry ripe rot caused by fungus Colletotrichum sp. is one of the most serious pathogens of blueberry (Vaccinium corymbosum L.) in the main growing regions in the world. During blueberry disease monitoring in 2009 and 2011 it was found that ripe rot has become a problem also in plantations of Latvian farmers. Losses caused by ripe rot are about 10-50% in the field, but main losses are at the storage – at high level of infection 100% of the berries become rotted and unmarketable. From 14 assessed plantations in 2009 and 11 assessed in 2011, in three, and five of them accordingly infected berries where found. In this study applications of different fungicides – Signum WG (boscalid, 26.7%, pirclostrobin, 6.7%), Effector WG (dithianon, 700 g kgE-1), Cabrio Duo EC (piraclostrobin, 3.8 %, dimetamorph, 6.9%), Svich 62.5 WG (ciprodinil, 375 g kgE-1, fludioksonil, 250 g kgE-1), commercial Bacillus subtilis s.c. (Bacillus subtilis, 1-5%) and Timorex EC (oil of Melaleuca alternifolia, 660 g LE-1) were carried out. Choice of fungicides was based on literary data. The most effective fungicides were Signum and Cabrio Duo, both containing active ingredient boscalid. Fungicide Effector also showed better efficacy. Incidence of disease was slightly reduced by using biological fungicide with Bacillus subtilis. It could be necessary to test it in combination with chemical fungicides in the future.
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