Ten formulations belonging to 8 chemical families approved on Strawberry plants in Morocco were tested in vitro and in vivo. Cyprodinil + fludioxonil induced a significant inhibition of mycelial growth of the Botrytis cinerea and Pestalotia longisetula isolates reaching 90.5% at low dose (93.7 ppm). The inhibition percentages of Bartalinia laurina and Colletotrichum gloeosporioides were equal to 68.3 and 59% at 375 ppm. Complete inhibition of germination of 7 isolates was noted at 93.7 ppm. In comparison, mepanipyrim and pyrimethanil were less active on mycelial growth, its inhibition percentages ranged from 5.2% to 88.4% at low concentrations and 24.3% to 93.2% at 800 ppm. Inhibition percentages of the conidia production ranged from 23.2% to 98.8%, for those against the germination has reached 100% especially in the presence of mepanipyrim. Thiram was more effective than mancozeb, it reduced by 79% to 100% mycelial growth of seven isolates respectively at 500 ppm and 2000 ppm and completely inhibited sporulation and germination of seven isolates. The effect of pyraclostrobin + boscalid combination was enhanced against C. gloeosporioides ranging from 91% to 100%. Facing fenhexamid, isolates of B. cinerea were more sensitive with percentages of inhibition of 85.3% to 100%, while those relating to chlorothalonil ranged between 34% and 92%. As for procymidone, its action is more significant on the growth of B. cinerea isolates and P. longisetula with a percentage exceeding 80% inhibition at 500 ppm.
In vivo, Cyprodinil + fludioxonil combination was the most powerful with inhibition percentage adjusted to 100% against B. cinerea and C. gleoesporioides. Fenhexamid provided similar protection against B. cinerea 3 days after inoculation followed by pyrimethanil (70%) and procymidone (66.6%) and chlorothalonil (42.6%). The preventive effect of thiram and pyraclostrobin + boscalid combination was more apparent against C. gloeosporioides, rots inhibition percentages were 83.6% and 57% respectively.