BIOLOGICAL-CONTROL OF DRECHSLERA-TERES - ABILITY OF ANTAGONISTS TO REDUCE CONIDIA FORMATION, COLEOPTILE INFECTION AND LEAF INFECTION IN BARLEY (HORDEUM-VULGARE)

Preventive seed application of an Actinomycete, Trichoderma viride, My rothecium verrucaria or Trichoderma pseudokoningii reduced seed-borne Drechslera teres infection of barley coleoptiles by 90%, 87%, 79% and 76%, respectively. Moreover, leaf infection after artificial inoculati on was decreased by 87%, 84%, 79%, 77% and 71% when the Thibaut cultiv ar had been previously treated at the three-leaf stage with Myrotheciu m verrucaria, Actinomycete, Trichoderma sp., Trichoderma viride or Tri choderma pseudokoningii, respectively. These antagonists also reduced conidia formation on straw colonized by D. teres.