Painted bug
A bright black-and-orange bug that hits mustard twice — sucking seedlings dry just after emergence and shrivelling the seed at maturity.
- Pest type
- Sap-sucking bug
- Attacks
- Seedlings & maturing pods/seed
- Worst in
- Warm, dry weather; emergence & maturity
- Main risk
- Seedling wilt; shrivelled seed
Overview
The painted bug is a small, shield-shaped bug with striking black-and-orange (or red) markings that is an important pest of mustard/rapeseed and other cole and oilseed crops. It is damaging at two distinct stages, which is what makes it dangerous.
Just after the crop emerges, adults and nymphs cluster on the tender seedlings and suck sap, wilting and even killing them and thinning the stand in warm, dry conditions. Then, as the crop matures, the bug moves to the ripening pods and drying plants, sucking the developing and mature seed so it shrivels, loses weight and yields less oil — and can also downgrade harvested, threshed seed. So control focuses on protecting the seedling stage and the maturing/harvest stage in particular.
How to identify it
- Small shield-shaped bugs boldly marked in black with orange or red, clustered on seedlings or on maturing plants and pods.
- Wilting, drying seedlings just after emergence where the bugs are sucking sap, thinning the stand.
- Shrivelled, shrunken seed and drying pods on maturing plants where the bug has fed.
- Bugs congregating on cut, drying plants and threshing heaps at harvest.
The damage it does
- Wilting and death of tender seedlings soon after emergence, thinning or gapping the stand.
- Shrivelled, low-weight seed with reduced oil content from feeding on maturing pods.
- Downgraded harvested seed where bugs feed on drying plants and threshing heaps.
- Worse in warm, dry conditions at both the emergence and maturity stages.
When to act
- Watch the crop closely just after emergence, when seedlings are most vulnerable, and again as the crop matures and dries.
- Act promptly on seedling infestations in warm, dry spells before the stand is thinned.
- Protect the maturing crop and manage the bug at harvest to avoid seed damage on drying plants and heaps.
Organic & cultural control
- Sow at the recommended time and ensure good, quick, uniform germination so seedlings pass the vulnerable stage fast.
- Give a light irrigation at the seedling stage in warm, dry weather, which discourages the bug and helps the seedlings.
- Do not leave cut, drying plants and threshing residue lying, where bugs congregate and feed on seed; clean up promptly.
- Collect bugs from heaps and destroy crop residue after harvest.
Chemical control
- Where seedlings or maturing crop are heavily attacked, use a CIB&RC-registered insecticide for the crop, directed at the bugs on seedlings or maturing plants.
- Time protection to the two vulnerable windows — emergence and maturity — rather than the whole season.
- Observe the pre-harvest interval, especially near harvest on the seed crop.
- Confirm the current recommendation and dose for your area with your local KVK.
Crops most at risk
Where this problem is called out in our crop guides — open a crop for the full package of practices.
Frequently asked questions
Small black-and-orange bugs are wilting my mustard seedlings. What are they?
Those are painted bugs. They cluster on tender mustard seedlings just after emergence and suck the sap, wilting and even killing them and thinning the stand, especially in warm, dry weather. The same bug attacks again at maturity, shrivelling the seed. Protect the seedlings promptly and again as the crop matures.
Why does the painted bug matter both early and late?
Because it damages mustard at two stages. Just after emergence it wilts and kills seedlings, thinning the stand; then at maturity it sucks the developing and ripe seed on drying pods and plants, shrivelling it and cutting oil, and can downgrade threshed seed. So control targets both the seedling stage and the maturity/harvest stage.
How can I reduce painted-bug damage without heavy spraying?
Sow on time for quick, uniform germination so seedlings pass the vulnerable stage fast, give a light irrigation in warm dry spells at the seedling stage, and at harvest do not leave cut drying plants and threshing residue lying where bugs feed on the seed — clean up promptly. Reserve a registered insecticide for heavy infestations at the two vulnerable windows.
Symptoms and control measures follow ICAR, KVK and state agricultural-university package-of-practices; any named chemical is a registered use. Always read the product label and confirm the dose for your crop and zone. editorial policy.