It is possible that the combination of carbendazim and mancozeb fungicide have low disease suppression than their individual effect in the case of alternaria disease in plants
Benzimidazole fungicides are largely ineffective against dematiaceous fungi such as Alternaria.
Propoconizole Tilt Syngenta is very effective against dematiacous fungi if you were looking for a broad based supplement chlorothanil Bravo Diamond Shamrock would be a good potential complement.
The tomato and potato leaf pathogens Alternaira solani known as early blight can be put into a Google Scholar search with the term efficacy and you review some of the latest evaluation which might be useful for your objectives and testing.
Varieties are available in these crops which have some intermediate resistance and would be a first choice if they can produce the produce you want.
Sir Paul!
Is it possible that combine effect of both fungicide may not have much suppression than it's individual effect?
Combination need to tried out but I think there is good indication that they might be compatible for mixed use but your always need to test it out.
Carbendazim is a metabolite of benomyl while mancozeb fungicides are ethylene- bis -dithiocarbamate. They both have broad spectrum of action and as such high possibility that their combination will increase the control specificity, unless proven otherwise in test experiment.
The rationale behind such observation is that the active components inherent in both carbendazim and mancozeb are rendered inactive or deactivated by mixing both chemicals before application. The chemical reaction is normal & your observation is not out of place.
It is equally possible for the fungicides to perform better when combined. The only way to find out is to carry out a pilot study
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