If the plants truly have blood disease infection (named for the reddish-brown discoloration of the pulp in infected fruits), I do not think that any pesticide will help. Blood disease of plantains and bananas is a systemic internal bacterial wilt, caused by a strain of Ralstonia (Pseudomonas) solanacearum. I looked up some information on this disease. It seems the disease is primarily found in Indonesia and has been managed by eradication of infected plants, quarantine (restrictions on the movement of vegetative plant parts) and the search for resistant cultivars.
Please send some images of the plants and we can help you diagnose. That should be the first step in deciding the action to take
over 10 years ago.
Also, where are you located? Pesticide regulations vary greatly between regions/countries over 10 years ago.
I THINK FIRST YOU HAVE TO BALANCE THE Ph OF SOIL,THEN SEED SELECTION AND SEED TREATMENT WITH ORGANIC FUNGICIDES(PSEUDOMONAS,TRICHODERMA ETC,)BEFOR PLANTING PUT 250GMS OF CRUSHED NEEM FRUIT(DRIED) ,NEVER ALOOW THE CHEMICALS IN THE FORM OF PESTICIDES OR FERTILIZER IN THE FARM .USE VERMICOMPOST,SHADE DRIED COWDUNG, NITROGEN,POTASH FIXING BACTERIA .ALL THESE THING KEEP YOUR FARM FRESH AND GREEN about 10 years ago.