1. A method of controlling or preventing infestation of plants or plant propagation material and / or harvested food crops are sensitive to infestation by microorganisms, by treating plants or plant propagation material and / or harvested food crops an effective amount oksaborola general formula (I), where each of a and D is independently hydrogen, optionally substituted Ci ^ alkyl, arylalkyl, aryl or a heterocycle, or wherein a and D together with the carbon atoms to which they are attached, form a 5-, 6- or 7-membered fused ring which itself may be substituted X represents a group -CRR wherein each of R independently represents hydrogen, optionally substituted Ci ^ alkyl, nitrile, nitro, aryl or arylalkyl, or r and together with the carbon atom to which they are attached form an alicyclic ring R represents hydrogen, optionally substituted Ci ^ alkyl, arylalkyl, aryl, heteroaryl, cycloalkyl or a radical of formula (II), wherein a, D and X are defined vyshe.2. The method according. 1, where membered fused ring which may be substituted Calkilom, alkoxy, hydroxy, halogen, nitro, nitrile, amino (optionally substituted with one or more Calkilnymi groups), carboxy, acyl, aryloxy, carbonamide (optionally substituted Calkilom) , sulphonamido or trifluoromethyl or the fused ring may link two rings oksaborola -CRR X represents a group wherein each of R independently represents hydrogen, optionally substituted Ci ^ alkyl, nitrile, nitro, aryl, aralkyl, or R together with the carbon atom to which they are of connecting1. Способ контроля или профилактики заражения растений или растительного материала для размножения и/или собранных продовольственных культур, чувствительных к поражению микроорганизмами, путем обработки растений или растительного материала для размножения и/или собранных продовольственных культур эффективным количеством оксаборола общей формулы (I),где каждый из A и D независимо представляет собой водород, необязательно замещенный C1-18алкил, арилалкил, арил или
