Humnasur: Undertaker of White Grub & an Excellent Soil Conditioner

Humnasur: Undertaker of White Grub & an Excellent Soil Conditioner

White grubs are undersoil-dwelling larvae of beetles. They feed on the roots and ruin the plants' ability to absorb water and nutrients. White grubs are typically bent in the "C" shape. Full-grown length varies from 3/4 to 1 inch.

The infestation of white grub is out-of-site. In well flourishing fields, sudden stunting and yellowing become visible. Crop starts drying even in good water fields. The speed of such drying is enormous enough to give a major setback. No infestation can be observed in aerial parts; however, the crop gets easily uprooted as white grub feeds voraciously on roots.


The white grubs routinely damage residential/sports lawns, groundnut, pearl millet, sorghum, maize, sesamum, and sugarcane fields. However, recently it was observed that pest has widened the host rage and 70 to 75 percent losses were observed in soybean, gram, cotton, turmeric, ginger, onion too. Its infestation is severe during the Kharif season (southwest monsoon, June to October) causing serious damage. Since chemical control of the grubs is ineffective according to the severity of the infestation, the crop is either harvested early or uprooted to empty the field.

Literature suggests multiple methods for control of white grub viz. collection and killing of white grub beetles during their nuptial meet on trees, intercropping with soft target crops, deep summer plowing, alluring birds to eat grubs during plowing, the release of predator insects, release of parasites and chemical spraying. However such attempts seldom solve the problem.

We recommend our product Humnasur (literally meaning undertaker for white grub) for the control of white grub (called Humni in Marathi).

Humnasur causes an epidemic of fungal infection in white grub. The fungal pathogen enters the white grub, kills it and re-emerges to continue its life cycle. It continues to attack more and more grubs and similar soil dwellers. Humnasur causes devastation of white grub in a true sense. 

Humnasur is a microbial soil conditioner enriched with diverse microbial cultures that are known to feed on numerous soil dwelling plant-root parasites including insects and fungi. This helps soils to suppress soil insects, fungi causing root knots, stunting, drying of the crop, wilting and root rot.

These cultures can also grow in a saprophytic mode which helps them to remain active for the longer duration.

We recommend the application of 3 kg Humnasur culture per acre. An application can be made through drip, drenching or broadcasting (after mixing with compost).


Mixing of Humnasur with compost




Modus operandi of Humnasur can be understood if one studies the life cycle of white grub.

Life cycle of white grub

Beetles of white grub emerge from the undersoil in the evening soon after pre-monsoon rain. They fly to nearby trees for mating. Male dies soon after mating and females lay eggs in the soil of fields. Each female lays about 50 eggs. This is the exact timing when a farmer plows and mix the manure on a farm. After incubation of 15 to 18 days, juvenile grubs emerge from eggs. Initially, they feed on incompletely rotten manure and then turn to roots of standing crop. During this feeding phase, it passes through three molts viz. 60 to 90 days, 55 to 110 days and last one that extends for 4 to 5 months.  Well-developed white grub then forms cocoon at depth of 70 centimeters. This stage is of 20-22 days, after which beetle emerges. This reemergence spans through a year.  It is clear that the major life cycle of white grub is underground. Humnasur is designed to intercept at this underground stage unlike most other methods recommended in the literature which target a small above ground phase.

We have observed the ability of Humnasur to improve soil activity against Nematodes and white ants too. 

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