Leaf spot is a common fungal disease in chilli, appearing as small brown or dark circular lesions on leaves that can merge and cause premature defoliation, weakening the plant and cutting yield. It's driven by several different fungal pathogens, which is why growers rotate between chemistries with different modes of action. Here are eight proven solutions.
1. Carbendazim 12% + Mancozeb 63% WP
This classic combination pairs a systemic benzimidazole (Carbendazim) with a multi-site contact fungicide (Mancozeb), giving both internal and surface protection. It's one of the most widely used fungicides in India for leaf spot, fruit rot, and powdery mildew across chilli and many other crops.
Product Recommendations
2. Copper Oxychloride 50% WP
Copper oxychloride is a classic protective fungicide that works through contact action, gradually releasing copper ions that disrupt fungal (and bacterial) cell enzymes. It's widely used on leaf spot and related fungal and bacterial diseases in chilli, especially where both fungal and bacterial pressure is present.
Product Recommendations
3. Mancozeb 75% WP
Mancozeb is a broad-spectrum, multi-site contact fungicide from the dithiocarbamate group. Because it acts on several points in the fungal cell at once, resistance development is rare, making it a reliable rotation partner for leaf spot control in chilli.
Product Recommendations
4. Azoxystrobin 8.3% + Mancozeb 66.7% WG
This combination pairs a systemic strobilurin (Azoxystrobin) with a contact fungicide (Mancozeb), giving dual-mode protection. It's specifically registered for leaf spot, anthracnose, and powdery mildew in chilli, and also supplies zinc and manganese for a phytotonic effect on the crop.
Product Recommendations
5. Hexaconazole 75% WG
Hexaconazole is a systemic triazole fungicide that inhibits ergosterol biosynthesis, a key component of the fungal cell membrane. Its 75% WG formulation offers protective, curative, and antisporulant action against leaf spot and related diseases in chilli with a long duration of control.
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6. Tribasic Copper Sulfate 34.5% SC
Tribasic copper sulfate is a newer-generation fixed-copper fungicide with a controlled-release mechanism: part of the copper ions are released immediately for quick action, the rest release gradually for extended protection. Its ultra-fine particle size gives better spray coverage than older copper formulations, without staining leaves.
Product Recommendations
7. Kresoxim-methyl 15% + Chlorothalonil 56% WG
Kresoxim-methyl is a strobilurin with meso-stemic and translaminar movement, paired here with Chlorothalonil, a multi-site contact fungicide. Together they offer protective, curative, and eradicative action with long residual control against leaf spot in chilli.
Product Recommendations
8. Myclobutanil 10% WP
Myclobutanil is a systemic triazole fungicide that inhibits ergosterol biosynthesis, providing both preventive and curative control. It's registered for leaf spot, powdery mildew, and dieback in chilli, and is valued for its ability to act on infections up to 96 hours after they start.
Product Recommendations
Disclaimer: Always confirm current label registration, approved dosage, water volume, and pre-harvest interval (PHI) for your state before using any product — labels are periodically revised by regulatory authorities.
This guide is a general advisory. Do your own research and verification before using any product. Always confirm suitability for your crop stage, region, and field conditions before making any purchase, spray, or crop-management decision.
