Mealybug Control

Symptoms

Look for white waxy cottony masses on stems, leaf joints, growing points and under leaves. Affected parts become sticky with honeydew and black sooty mould, leaves crinkle and bunch up, and shoots are stunted and twisted. Heavily infested plants look white coated and may dry up.

Damage

Mealybug (mainly Phenacoccus solenopsis) sucks sap heavily and injects toxins that distort growth, causing bunchy tops, crinkled leaves and stunting. Honeydew leads to sooty mould that lowers photosynthesis. Severe infestation can cause major yield loss and even plant death, and the pest spreads fast through ants, wind, tools and workers.

Organic & cultural control

Release the predator beetle Cryptolaemus montrouzieri and conserve natural enemies including the parasitoid Aenasius bambawalei. Spray neem oil 5 ml per litre or fish oil rosin soap on colonies. Remove and burn heavily infested plant parts. Control ants that protect mealybugs, and clean tools and footwear to prevent spread between fields.

Chemical control

Spot spray affected patches early rather than the whole field, since the waxy coating resists sprays. Recommended actives such as profenophos, buprofezin or thiamethoxam with a wetting agent can be used. Treat field bunds and host weeds too. Always read and follow the product label, observe the pre-harvest interval, and consult your KVK or a qualified agronomist before spraying.

Always follow the product label, the recommended pre-harvest interval, and your local KVK or agronomist. Pesticide approvals change, so verify before use.

Prevention

Use clean, mealybug free seedlings and tools, and inspect field borders and weeds where the pest survives. Destroy crop residue and host weeds like Parthenium after harvest. Control ants, avoid moving infested material between fields, and monitor regularly so spot treatment can stop early patches before they spread.