Why a pesticide spray will not fix a nutrient problem

When a crop turns pale, curls or drops flowers, a common habit is to spray a pesticide or fungicide in case a pest is behind it. If the real cause is a nutrient shortage, the spray cannot fix it: it costs money, adds residue, kills helpful insects and delays the right action. Check for pests first; if there are none, look at the leaves for nutrient patterns and test the soil.

By Gafar Laiya and the Gujarat Bio Organics team. Updated November 2026.

Why it happens

• Weak plants look like a pest problem.
• Sprays are easy to buy and quick to apply.
• Pest damage and nutrient shortage can look alike: curling, yellowing, spots and drop.

What an unneeded spray costs

• Money for the product and the labour.
• Residue on the crop and in the soil.
• Loss of helpful insects such as pollinators and natural enemies of pests.
• Pests that become harder to control when sprays are overused.
• Time lost while the real cause keeps cutting yield.

Check this before you spray

• Look for the pest itself: check the underside of leaves, shoots and fruit with a hand lens.
• Look for droppings, webbing, holes or eggs.
• Check whether the symptom follows a nutrient pattern: old or young leaves, between veins, tips.
• Use our symptom guide and test the soil.
• Ask before you spray: send us a photo on WhatsApp.

When both are true

A nutrient-short crop is weaker and attracts some pests, so both can happen together. Fix the nutrition and control the pest only when scouting shows it is there. A balanced crop usually needs fewer sprays.

Doses depend on the crop, soil and product, so this page gives methods, not amounts. Take the dose from your soil test report, the product label or your local agriculture officer or KVK. Results differ from farm to farm with soil, weather, crop and management. Farmer experiences on this site are their own reports, not a promise of results.