Effect of low volume copper sprays with polyisobutene sticker on mango blossom blight (Glomerella cingulata) in Dominica.
Prior C., Ryder K.
Author Affiliation: CAB International Inst. Biol. Control, Imperial Coll., Silwood Park, Ascot SL5 7PY, UK.
Tropical Pest Management 33 : 350-352
Abstract : Two spraying strategies to control G. cingulata were tested. In one trial, a single dose of 4% copper oxychloride (18 g/tree) was applied to foliage before flowering, while in the other fortnightly applications of concn up to 2%, starting after flowering, were compared. The early single dose gave an increase in fruit set, whereas repeated doses gave no significant effects. Early application followed by low volume spraying of protectant fungicides, may reduce the cost of disease control. The addition of 0.5% polyisobutene sticker, tested in the single dose trial, improved fruit set. In vitro tests showed that the fungus was less sensitive to copper than to chlorothalonil and some systemic fungicides.