RADICAL COLONIZATION BY THE MYCORRHIZAL INIFAPMR IN BARLEY TREATED WITH FUNGICIDE

Abstract

The effect of the treatment with the fungicide chlorothalonil on radical mycorrhizal colonization on barley seed was evaluated. An experiment was performed, the factors were as follows: 1) Mycorrhiza INIFAP® (uninoculated, one, two and three doses) and fungicide (with and without fungicide). Monthly sowings were conducted to determine the degree of colonization in the roots. The results showed that treatment of the seed with chlorothalonil was not significantly decreased by the radical mycorrhizal INIFAP® colonization, chlorothalonil treatment had a mean of 32.63% root infection whereas without chlorothalonil was 36.46%. When the seed was treated with chlorothalonil, the more affected in terms of root colonization by mycorrhizal INIFAP® was a dose, treatment with double and triple doses showed no significant difference between them. Storage of seed infection percentage decreased progressively. Through the time of the inoculated seed storage, root infection by mycorrhizal INIFAP® remained constant and unchanged for the first six months, but then decreased at ca. 50% over a period of 10 months, when treated or not treated with fungicide.