Tea mosquito bug
A slender bug that injects toxic saliva into tender flush and fruit — each puncture a dark corky spot, heavy attacks blighting the shoots.
- Pest type
- Sap-sucking bug
- Attacks
- Tender shoots, leaves, fruit
- Worst in
- Cool, humid, shaded flush
- Main risk
- Blighted flush; corky fruit spots
Overview
The tea mosquito bug (Helopeltis) is a slender, long-legged sap-sucking bug — mosquito-like in build — that is a major pest of tea, and also of guava, cashew and several other crops. Both the adults and the nymphs feed on the tender shoots, young leaves and developing fruit by pushing in their stylets and injecting a toxic saliva.
Each feeding puncture kills a small patch of tissue, leaving a dark brown to black, sunken, corky spot. As the shoot grows these spots multiply and the tender flush is blighted, curling, drying and dying back; on guava and cashew the fruit becomes scabbed and cracked with corky feeding lesions. The bug prefers cool, humid, shaded conditions, so it is worst in the flush periods and in dense, shaded plantations.
How to identify it
- Dark brown to black, sunken, corky spots on the tender shoots, young leaves and fruit — one per feeding puncture, multiplying over time.
- Slender, long-legged, mosquito-like bugs on the flush, quick to move and drop off when disturbed.
- Curled, drying, blighted tender shoots and dying-back flush in a heavy attack.
- On guava/cashew, scabbed, cracked, corky feeding lesions on the fruit.
The damage it does
- Corky feeding spots that coalesce and blight the tender flush, curling and drying the shoots — the main loss on tea.
- Reduced yield and quality of the harvested flush/leaf.
- Scabbed, cracked, corky fruit on guava and cashew that is downgraded or rejected.
- Repeated attacks over successive flushes that steadily weaken the bush.
When to act
- Protect each tender flush, which is when the bug concentrates and feeds; monitor the new growth closely during flush periods.
- Act early on the first corky spots and bugs, before the whole flush is blighted.
- Watch cool, humid, shaded conditions especially, which favour the bug.
Organic & cultural control
- Regulate shade and prune to open the canopy — the bug favours dense, humid shade, so a more open, airy plantation suffers less.
- Keep the plantation and its surroundings free of alternate host weeds and plants that harbour the bug.
- Spray neem on the tender flush to deter feeding, and conserve natural enemies (predatory bugs, spiders).
- Time flush/plucking rounds and cultural operations to reduce the continuous tender growth the bug depends on.
Chemical control
- Where the bug is damaging the flush, use a CIB&RC-registered insecticide for the crop, directed at the tender new growth where the bug feeds.
- Time sprays to protect each flush and rotate insecticide groups to avoid resistance.
- On tea and edible fruit, strictly observe the pre-harvest/plucking interval on the label.
- Confirm the current recommendation and schedule for your area with your local KVK, tea board or horticulture department.
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
My tender tea shoots (or guava fruit) have dark sunken corky spots. What is it?
That is the tea mosquito bug (Helopeltis). It punctures the tender shoots, leaves and fruit and injects a toxic saliva, and each puncture leaves a dark, sunken, corky spot. As the spots multiply the flush is blighted and dies back, and on guava/cashew the fruit becomes scabbed and cracked. Protect each new flush and open up the canopy.
Why is the tea mosquito bug worse in shaded, humid plantations?
Because it favours cool, humid, shaded conditions and continuous tender flush to feed on. A dense, over-shaded, humid plantation gives it exactly that. Regulating shade, pruning to open and air the canopy, and keeping alternate host plants down all make the plantation less hospitable and reduce the damage.
When should I spray for it?
Time control to protect each tender flush, since that is when the bug concentrates and does its damage — act early on the first corky spots rather than after the flush is blighted. Use a registered insecticide directed at the new growth, rotate groups, and on tea and edible fruit strictly observe the plucking/pre-harvest interval. Confirm the schedule locally.
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.