Rupinder Singh Dear Rupinder Singh, I am sure that you can isolate from these spots some pathogenic Pseudomonas and Pantoea bacteria, but it is hard to say about true reason for this disease. Bacterial plant disease diagnostics by photograph only is not reliable. You have to provide additional information - time/plant growth stage of the first symptoms occurrence, dynamics of spots development, weather conditions at least for 2 weeks before the disease occurrence (temperature, rains, air humidity), chemical treatments inlcuding fertilization, irrigation type, number of affected plants in field, location of the diseased plants in the field (field margins, spots, spreading), previous crop on this field, current crops around the zucchini field.