Integrated Disease Management (IDM) in Pomegranate: Bacterial Blight, Wilt, Fruit Spot, Anthracnose and Heart Rot, with a Stage-Wise Spray Schedule

Pomegranate disease management is a package, not a single spray. ICAR-NRCP says no chemical and no variety gives complete control of bacterial blight (telya), so you combine clean planting material, a 3 to 4 month rest period, hard pruning with Bordeaux paste, orchard sanitation, balanced feeding, bio-agents and need-based sprays every 7 to 15 days by stage. A Karnataka KVK demonstration of this package cut fruit disease incidence from 38.95 to 26.35 percent and lifted yield from 9.75 to 13.5 tonne per hectare. Wilt needs soil drenches right after harvest; fruit spots, anthracnose and rots need preventive sprays from flowering.

IDM means Integrated Disease Management: you stop treating disease as something that begins when you see it, and manage the whole year instead. In pomegranate that means planting clean, pruning on time, resting the tree, feeding it in balance, keeping the orchard clean, helping the soil with good microbes, and spraying the right product at the right stage. ICAR-NRCP, Solapur, calls its version the IDIPM schedule (disease and insect pest management).

The reason for the package is blunt. The NRCP farmers' FAQ says no single chemical can check bacterial blight completely, and that NRCP screened more than 375 germplasm lines, seedlings and hybrids without finding a resistant one. Disease losses are real: the KVK Bagalkote paper reports blight losses of 30 to 50 percent depending on pathogen load and weather, up to 80 percent in an epidemic, and about 40 percent in the orchards of Bagalkote district.

Six problems cause most of the damage: bacterial blight (telya), wilt, Cercospora leaf and fruit spot, Alternaria leaf and fruit spot, anthracnose, and fruit rots including heart rot. Look at the spot, the feel and the weather. A sticky, oily, cracked spot is blight. A dry spot with no stickiness is fungal. A tree dying branch by branch is wilt.

These descriptions come from the NRCP chapter in the MANAGE high-tech pomegranate ebook and the NRCP FAQ. Fruit scab (Elsinoe punicae), Aspergillus, Penicillium, Phomopsis and Rhizopus rots also occur. Most rots can only be named after the fungus sporulates, so do not spend money on a guess; send a sample to your KVK if the pattern is unclear.

Bacterial blight, called telya or oily spot, is caused by the bacterium Xanthomonas axonopodis pv. punicae. It lives in stems, nodes, buds and fallen debris, and a plant grown from a blight orchard can carry it hidden. Rain splash, wind, tools, people and contact spread it. It needs water, so wet weather decides the outbreak.

• Early signs. Small oily spots under the leaf, oily skin spots on young fruit, and grey water-soaked tissue around nodes of young twigs. Cut stems later show dark cankers.
• Speed. In an infected orchard, new infection shows within 4 to 7 days of the bacteria entering the leaf or fruit, when rain or spray water is available.
• Weather. It grows fast at 25 to 35 degrees C and above 50 percent humidity, needs only 0.1 mm of rain, and spreads further when wind reaches about 3.5 m per second with rain. It slows when temperatures stay below 20 or above 35 degrees C, or when humidity stays under 30 percent.
• Nutrition. Excess nitrogen raises blight. Balanced calcium, magnesium, iron, manganese, zinc and copper reduce it. NRCP also notes that varieties with more potassium in the fruit were more susceptible.
• Planting material. In a new orchard, hidden infection in cuttings or air layers usually shows as blackened nodes just above ground at 5 to 7 months of age. Nursery plants show nothing for at least 5 to 8 months, so buyers cannot see it.

A useful point from the same FAQ: the blight bacterium cannot live in soil without pomegranate tissue for more than about 30 days. After a badly infected orchard is removed and the plant parts have rotted, the soil itself is not the long-term problem. Remove all stems and fruit (they rot slowly), rake the soil in the hottest months, grow a green manure like dhaincha, and replant after the rains.

NRCP's six-step schedule is meant for mrig bahar and late mrig bahar orchards that suffer from blight. Prune hard after harvest, give a 3 to 4 month rest with sprays, stress the trees to full leaf fall, expose bare stems to the sun for 15 to 20 days, prune lightly, then follow the crop-season spray schedule. Everyone in the locality should do it together.

Two cautions from NRCP. This works as a community programme: if your neighbour's trees keep blight, your clean orchard will catch it again. And nitrogen goes in split doses after the lemon-size fruit stage, not heavily before flowering. For the soil test behind the feeding, see our guide to reading your soil health card.

NRCP lists copper hydroxide 53.8 percent WP at 1.5 to 2 g/L, copper oxychloride 50 percent WP at 2.5 to 3 g/L, and freshly made Bordeaux mixture at 0.5 to 1 percent. It also lists bronopol at 0.5 g/L. Rotate them. Use Bordeaux 1 percent just after pruning, 0.5 percent after that.

NRCP gives these rules for every spray round, and farmers break most of them:

1. Spray only when needed and at the full dose. Too many sprays, or low doses, make blight worse because water without enough bactericide only feeds the bacterium.
2. Remove and destroy blight-affected or rotting fruit before you start the round. Do not dump it in or near the orchard; bury it in a pit and cover with soil.
3. Keep a 7 to 14 day interval depending on weather, and 10 to 15 days if rain has not come for long or blight is not rising.
4. In affected plots, add a bactericide spray after rain, as soon as the plant surface dries.
5. Add a good non-ionic spreader sticker to every spray except Bordeaux.
6. Mix dilute solutions of each chemical separately, then combine. If a precipitate forms, the mix is incompatible. Keep the final spray at pH 6.5 to 7.0.
7. Read the active ingredient on the pack. NRCP warns against products that do not print the percent active ingredient.

For an emergency, when 5 to 10 percent of fruit shows blight, NRCP suggests one or two sprays at 4 day intervals with a bactericide plus copper hydroxide (2 g/L) or carbendazim (1 g/L) and a spreader. How you apply matters as much as what you apply; our guide on fungicide application methods and the note on choosing the right sprayer cover nozzle, volume and coverage.

Yes. ICAR-KVK Bagalkote ran the UAS Dharwad IDM schedule in ten farmers' orchards (about 4 ha) at Kaladagi village over two seasons, on Kesar and Bhagwa. Fruit blight incidence was 26.35 percent against 38.95 percent in farmers' own practice, and yield was 13.5 against 9.75 tonne per hectare.

The paper's 15-spray schedule is useful because it shows what rotation looks like on a calendar. Doses are per litre of water.

The IDM year starts after harvest, not at flowering. For a mrig bahar crop the cycle runs from harvest in December to February, pruning, a rest period, stress, bare-stem sun exposure, crop initiation around May to June, and flowering and fruiting through the rains. Bahars shift every date. Anchor the table to your flower regulation date.

Hasta bahar (flower regulation in September to October) and ambia bahar (January to February) follow the same logic with shifted dates. The NRCP FAQ puts mrig bahar flower regulation at May to June. In blight areas NRCP advises hasta or late hasta only, and prefers hasta for at least 2 to 3 years once blight appears, because the crop meets less rain. The KVK paper notes more blight in mrig bahar than in ambia or hasta.

Treat wilt in the rest period, right after harvest, and prevent it with soil bio-agents every 6 months. NRCP's drench protocols use propiconazole 25 EC at 2 ml/L plus chlorpyrifos 20 EC at 2 ml/L, followed by Aspergillus niger and mycorrhiza drenches, or fosetyl-Al and tebuconazole drenches. If more than 25 to 30 percent of the canopy is gone, chemicals rarely save the tree.

• Find the cause first. Split the root. Brown to black wood with an alcohol smell is Ceratocystis; a brown or red pith is Fusarium; knots and galls on roots are root-knot nematode; pin holes in the wood are shot hole borer, which likes weak and wilting plants.
• Drench at the right time. Irrigate well a day before, drench immediately after harvest in the rest period to avoid fruit residues, and stop irrigation for 2 days afterwards. Also drench the plants in a ring around a diseased tree: two to three plants on each side.
• Remove dead plants carefully. Plants with more than 25 percent dry branches or fully dead plants should be taken out and burnt, not stacked as firewood. Cover the root zone with a gunny bag while removing so soil does not spill and carry the fungus. NRCP also says to dig a 3 to 4 feet trench between healthy and wilted plants.
• Treat the pit. NRCP describes disinfecting the pit with formalin solution or by solarisation. Formalin is poisonous; if you do it, follow the NRCP method with a mask, gloves and eye protection.
• Shot hole borer. Paste the stem up to 2 feet from the base with a mix of 4 kg red soil, 20 ml chlorpyrifos 20 EC and 25 g copper oxychloride 50 WP in 10 litres, twice a year (after harvest and at defoliation).
• Prevent. Plant wilt-free saplings in sterilised potting mix, solarise the planting site for 6 weeks in April to May under 50 to 75 micron LLDPE sheet, plant on raised beds, grow dhaincha or sunhemp as green manure, and apply bio-agents (Aspergillus niger AN27, mycorrhiza, Trichoderma, Pseudomonas, Paecilomyces) at 1 kg per acre every 6 months.

These are fungal, so the sprays are preventive: start at flowering, repeat every 7 to 14 days depending on weather, and pair one systemic with one contact fungicide. NRCP lists azoxystrobin plus propiconazole, azoxystrobin plus difenoconazole, mandipropamid, hexaconazole plus zineb and tricyclazole plus mancozeb, among others. Remove infected fruit first.

These fungi wait on the plant surface and attack when the weather suits them, so waiting for symptoms is too late. If spots and rots return every year, NRCP says to move flower regulation from the rainy to the winter season. Here are the options from the NRCP chapter and the NRCP ad hoc list:

For Colletotrichum, the NRCP FAQ asks for sprays at 7 day intervals of tricyclazole plus mancozeb (2.5 to 3 g/L) or propiconazole (1 ml/L) plus chlorothalonil (2 g/L), and one systemic plus one contact fungicide each month from pre-flowering. If rot starts around pin-prick holes, the cause is fruit-sucking moth, not a fungus.

Rotate modes of action.

Heart rot is caused by Alternaria alternata. The fungus enters the flower, sits inside the crown, and rots the arils from within while the rind looks normal. NRCP gives no separate heart-rot spray. The practical answer is flowering-stage protection, orchard sanitation, and sorting fruit by weight and feel.

Per NRCP, infection takes place at flowering and the rot develops later, at 25 to 30 degrees C. Fruit may feel soft under light pressure and, later, light in weight. Cut it open and the arils are brown to black, sometimes with grey-black spores. Aspergillus rot is a different, softer rot that can also grow inside with no outside sign.

• Do the flowering-stage sprays on time. The NRCP spot and rot programme starts at flowering for exactly this reason: most of these fungi enter early and show late.
• Cut down the entry points. Control sucking pests and fruit borers, avoid cracking from uneven irrigation, and keep dead branches and old mummified fruit out of the orchard.
• Sort at harvest. Cut a few doubtful fruits, and weigh by hand; light, soft fruit should not go to the market or cold chain.

Press the fruit and look at the colour. Anthracnose rot is brown, hard and dry, with no spores on the surface. Phytophthora rot is tan, mushy and spreads over the whole fruit in 2 to 3 days, with white growth later. The two need different sprays.

Do not bag fruit in the rainy season or in orchards with blight, fruit rot or mealybug; bagged fruit becomes more prone to these, says the NRCP FAQ.

NRCP backs soil bio-agents for wilt and growth, and some foliar bio-agents for leaf diseases. Aspergillus niger AN27, mycorrhiza (Rhizophagus irregularis), Trichoderma viride, T. harzianum, Paecilomyces and Verticillium go to the soil. Bacillus subtilis, Pseudomonas fluorescens and Trichoderma sp. go on the foliage. They support the package; they do not replace the copper sprays.

NRCP's method: mix 1 kg of bioformulation with 1 tonne of well-rotted manure, keep the heap at 50 to 60 percent moisture under shade, turn it every 2 to 3 days, incubate 10 to 15 days, then apply 1 kg per acre of plants with the rest of the manure, twice a year (rest period and crop regulation). Buy a tested brand and store it properly. Never mix bio-products with chemicals; apply them 20 to 30 days after chemical fertiliser.

On the foliar side, a 2024 field study by NRCP scientists, Manjunatha et al. in Frontiers in Microbiology, tested three native Bacillus strains (B. haynesii, B. subtilis, B. tequilensis) against blight on 5-year-old Bhagwa trees at Solapur over two mrig bahar seasons. Five foliar sprays at 5 day intervals cut the disease index by 47 to 68 percent against untreated trees, and the authors report this was higher than the reduction from a bronopol product. These were NRCP's own strains, not commercial products, so do not read it as a promise for any bottle.

Katyayani stocks Pseudomonas fluorescens (Striker), Trichoderma harzianum (Hattrick) and a VAM mycorrhiza bio-fertiliser. Match the species on the pack and follow its dose. See the full range under bio fungicides. For the bigger question of when bio inputs are enough and when chemicals are needed, see our note on where bio and chemical inputs each win and the overview of biopesticide types.

Start with planting material and end with sanitation. NRCP's list of steps to keep an orchard free of blight is mostly cultural. Use disease-free saplings, plant just after the rains, let the plants grow two to three years before the first crop, take one crop a year with a rest, and keep strangers' tools and boots out.

• Buy clean. Check mother plants in June to October, take 2 to 3 month air layers or 5 to 6 month bagged plants, prefer bio-hardened material, and check that the nursery used sterilised potting soil. Tissue-culture plants are not safer by themselves; they catch blight from a nearby infected orchard.
• Plant at the right time. Plant just after the rainy season, never just before it, because tender new twigs catch blight in the rains. NRCP advises 2 feet wide beds, 1 foot high, and pits where soil depth is under 3 feet. Shallow, sandy loam is best; avoid black soil or reclaim it.
• Feed in balance. Avoid heavy nitrogen, and give micronutrients and organics. Use humic acid and sulphur to bring down soil pH if it is high (NRCP: 10 to 30 g per plant, by pH).
• Sanitise. Collect fallen leaves and fruit in a pit and cover with FYM and soil, or burn. Disinfect pruning tools after every plant. NRCP also describes wetting the upper soil below the canopy with bleaching powder solution (25 kg in 1,000 litres per hectare) every 3 to 4 months, especially after pruning.
• Keep weeds and cover management tight. A clean floor and a healthy mulch layer lower humidity at the base; our note on mulching types and depth helps you choose a mulch that does not hold water against the stem.
• Rotate crops before replanting. In a replant, take a crop of marigold, sunhemp, dhaincha, sorghum or wheat first (NRCP). Our guide to crop rotation shows how to fit it.

Other crops follow the same preventive logic: see mango flower pests and diseases, the papaya IDM guide and the IDM in chilli guide.

The CIB&RC fungicide list up to 30 September 2026 has pomegranate rows for azoxystrobin 23 SC, difenoconazole 25 EC, propineb 70 WP, metiram 70 WG, copper sulphate pentahydrate 6 SC, kasugamycin plus copper oxychloride, metalaxyl-M plus mancozeb and several mixtures. It has no pomegranate row for copper oxychloride alone, Bordeaux mixture, mancozeb alone or bio-fungicides.

This table is a selection of pomegranate rows from the CIB&RC list. Always follow your pack label.

Notice how different the waiting periods are from the export advice. The NRCP list gives pre-harvest intervals of 60 to 100 days for many of the same actives (azoxystrobin 75, difenoconazole 60, propineb 100, copper compounds 60), set around EU residue limits. The NRCP document itself says these are advisory and not legal. If you sell to an exporter or a cold chain, follow the buyer's residue protocol; otherwise follow the label, and give more gap than the minimum.

Where Katyayani stocks the same active, you can find it here. Concor (difenoconazole 25 EC) lists pomegranate among its crops. Azoxy (azoxystrobin 23 SC) is the same active as the CIB&RC pomegranate leaf and fruit spot row. Propineb 70 WP is the same active as the CIB&RC propineb row. For the copper step, copper oxychloride 50 WP is the active NRCP lists at 2.5 to 3 g/L. The Bordeaux mixture product is a ready-to-use solution, which is different from the freshly prepared 0.5 to 1 percent mix NRCP specifies. The full range sits under fungicides.

If EC, SC, WP and WG on the pack confuse you, see our explainer on pesticide formulation types.

Most disease seasons go wrong in the same few ways. NRCP's own FAQ lists them, and they cost more than any missing product.

• Spraying anything and everything. Too many sprays, daily or on alternate days, increased blight in NRCP's experience.
• Spraying below the dose. Low-dose bactericide does not kill the bacterium, and the water helps it multiply.
• Leaving infected fruit on the tree or in the field. Remove it before every spray. NRCP answers the old claim that removing fruit increases blight: it only looks that way because you now see the new cases.
• Dumping diseased fruit in the orchard or channel. It becomes the next outbreak.
• Planting just before the rains, or using cuttings from a blight orchard.
• Over-feeding nitrogen, or loading potash heavily where blight is present.
• Removing a wilted plant carelessly. Spilled root-zone soil can spread the wilt fungus to neighbours.

Wear gloves, a mask and full clothing when spraying, avoid strong wind, and keep a written record of each spray (date, product, dose, weather).

Conclusion

Pomegranate disease management pays when it starts at pruning, not at the first spot. Clean planting material, a proper rest, Bordeaux paste on every cut, sanitation, balanced feeding, bio-agents in the soil and need-based sprays at full dose gave a Karnataka demonstration about 3.75 tonne per hectare more fruit with a third less blight. Match each spray to its label and to your buyer's residue rules, and time every step to your bahar.