Water Loss, Botrytis rot, Fumigation effects.


Extending shelf life for Fruits & Vegetables.

An alarming percentage of fresh produce perishes long before it reaches the consumer. Most of this loss is accounted for by either natural degradation caused by bacteria and mould, or non-availability of good storage and transportation linkages. These losses could be minimized by suitable post-harvest measures to increase the shelf life of fruits and vegetables by inhibiting bacterial and mould growth. Straight forward washing of fruits and vegetables after harvest may simply redistribute organisms from infected to healthy produce.
Washing with fungicides/chemicals can leave bad taste, odour and undesirable residual toxicity on the produce which can lead to consumer rejection. With strict environmental regulation and controls imposed by most importing countries on pesticide residue levels in force, it is imperative to adapt to eco-friendly treatments.
Virosil Agro is an eco-friendly; non-toxic alternative to fungicides/chemicals currently used as post-harvest treatments for domestic marketing and export trade.

About Virosil Agro

Virosil Agro is a multi-component complex formulation containing Hydrogen Peroxide (H2O2) and Silver (Ag) in cationic form. Hydrogen Peroxide is known to have a strong germicidal effect. Silver is well known to posses anti-senescence properties. Virosil Agro is prepared by a special process in which both Hydrogen Peroxide and Silver are mixed, bonded and complexed to give an oligo-dynamic, stable and long lasting effect. Virosil Agro effectively reduces bacteria and mould without leaving any harmful chemical by-products as it breaks down into water and oxygen. The efficacy has already been widely proven in the water industry. Virosil Agro is environmentally benign (benevolent) and very effective against a wide spectrum of micro-organisms. Applied soon after harvest, Virosil Agro ensures farm-fresh appearance, original taste and quality even after prolonged storage during marketing.


Scope of Virosil Agro in post-harvest loss reduction of grapes in India with the development of modern agro-techniques, the production of grapes in India has increased many folds in the recent years which have resulted in Indian grapes occupying a major share of the export trade in the global market.

Although the grapes are non-climacteric fruits and have relatively low physiological activity, yet they are subject to severe water loss following harvests resulting in stem drying, browning, berry drop, wilting and shriveling of berries. Rough handling leads to the loss of natural 'bloom' or wax on the surface of berries followed by invasion by several rot-causing micro-organisms, resulting in poor marketing.


Therefore it is essential to use certain post-harvest treatments of bunches with appropriate chemical or fungicide in order to prevent this huge economic loss during post-harvest handling and marketing operations.

At present the majority of grapes in the commercial trade are treated with sulphur compounds either by fumigation or though SO2 leads to severe injury or berries which is of primary concern towards consumer's health in many countries. Virosil Agro can play a vital role in minimizing post-harvest losses of grapes through its anti-microbial and anti-senescence properties.


Sources of Damage
Water loss

Because of the susceptibility of stems and fruit to deterioration from water loss, grapes are normally cooled after harvest. Even a few hours delay at field temperatures can cause severe drying and browning of cluster stems. The problem is most serious in the hottest growing areas. Rapid cooling is widely used. Because grapes will not tolerate the wetting associated with hydro-cooling, most of the fruit is forced air-cooled.

Botrytis rot

The Botrytis rot problem is not entirely eliminated by forced cooling alone. The standard practice is to fumigate with sulphur dioxide (SO2) immediately after packing and in lower doses each week of storage. The usual fumigation method is the periodic introduction of sulphurdioxide into the storage room or fumigation chamber. In some growing areas, a continuous, very low level of sulphur dioxide is maintained in place of periodic treatments. In recent years So2 generating pads have been used, particularly in export marketing when grapes are in ocean transport for extended periods.
Sodium metabisulfite is impregnated and/or encapsulated into the pads to allow a slow release of sulphur dioxide through the transit and marketing period. This treatment however causes health problems associated with sulphur compounds which are not desirable

Fumigation effects

One problem associated with sulphur dioxide fumigation of grapes is the constant potential for injury to the end stems. Injured tissue first shows up as a bleaching of colour, followed by the sinking of areas where accelerated water loss has occurred. These injuries show first at the site of some other injury such as a harvest wound, transit injury, or breakage at the cap stem attachment. It can also be seen starting around the cap stem, and slowly spreading over the berry. Virosil Agro is environment-friendly and can play a vital role in minimizing post-harvest losses of grapes through its anti-microbial and anti-senescence properties.




Dosage in 10 litres of Water

Method of Application


Grape 250 ml Spray/Drench Prevention of Botrytis rot & other Post Harvest Diseases
Strawberry 250 ml Spray Prevention of Post Harvest Decay
Mango 250 mla Spray/Drench Control of Stem end rot Anthranose
Persimon 250 ml Spray Post Harvest decay control
Citrus 500 ml Drench Check development of control
Banana 250 ml Spray Prevention of collar end rot and Canker
Tomato 250 ml Spray /Drench Prevention of bacteriosis & post harvest microbial diseases
Brinjal 125 ml Dip/Spray Controlled fungal development during storage
Sweet red peppers 125 ml Dip Inhibited fungal development during storage
Muskmelon 250 ml Dip/Spral Signification control of decay during storage
Potato 125 ml Spray Decay control and sprout inhibition



2019-nCoV / Coronavirus update

Effective sterilization and disinfection of spaces is an essential tool in the fight to protect people from getting infected with Covid-19. Virosil Pharma disinfectants and cleaners use an internationally tried and tested formulation which has been proven to be highly effective against enveloped viruses.