ACTION OF THE COMBINATION OF ALTERNARIA ALTERNATA AND NEOCHETINA EICHHORNIAE ON GROWTH PARAMETERS OF THE WATER HYACINTH IN A CONTROLLED ENVIRONMENT

Alternaria alternata and Neochetina eichhornia are pathogens of water hyacinth which is a major invasive weed on our water ways in the south of Benin. We tested these two agents in a controlled environment on association water hyacinth. The device is made of four treatments with seven replicates .The association is made of two pairs of Neochetina eichhornia and Alternaria alternate with different sporulations 106sp/ml, 107sp/ml, 108sp/ml, 109sp/ml, 1010sp/ml, 1011sp/ml et 1012sp/ml on water hyacinth for twelve weeks and a few days. The average values of the significant parameters of growth at the of the experiment as the weight with sporulation of 1012sp/ml and of two pairs of Neochetina eichhoenia 18.80±0.35; those of leaves are 1.12±0.21 and those of buds are 0.80±0.13. Thus A. alternata is a potential as an agent of bio control of water hyacinth with block7 T4 treatment.