Wednesday 14 November 2018, 10:11 AM
The pink bollworm menace adds to Maharashtra cotton farmers' distress
By Meena Menon | Bharat Defence Kavach | Publish Date: 8/29/2018 4:52:51 PM
The pink bollworm menace adds to Maharashtra cotton farmers' distress

Mumbai: On August 10, when Sanjay Rathod walked to his lush cotton field in Lasina village in Yavatmal, Maharashtra, he noticed some closed yellow flowers. Opening them, he found to his horror the tiny larvae of the pink bollworm. He shared a photo with other farmers on Whatsapp groups and immediately got a response on what pesticides he should use. Accordingly, he sprayed an insecticide Larvin and some neem spray. They didnt have any effect. He is now terrified of a repeat of last year when he lost half the cotton on his six acres of land, to the pink bollworm menace.

From the main road, his field in a 15-20 minute walk and you can sink knee deep into the soft soil. Walking around, he obsessively checks each flower and finds a number of the pests. "They are early this year," he says, downcast. He has installed pheromone traps, in which he finds nothing, and a light trap as well.

The next day, the district agricultural officers paid a visit to his farm and found that the pest attack was not serious and below the economic threshold level (ETL). "It's a healthy field," proclaimed Pramod Yadgiriwar, associate director, research, zonal agricultural research station, Dr. Punjabrao Deshmukh Krishi Vidyapeeth, Akola. However, Rathod is not very convinced. He is still anxious that he will lose his crop as the scientists didn't check the whole field.

Over a week later, he found few pink bollworms but noticed sap-sucking pests and is now seeking advice from Yadgiriwar on how to deal with them. One of the issues with Bt cotton has been a resurgence of secondary pests, the mealy bug among them.

Light traps and pheromone traps dot the cotton landscape in Yavatmal district in Vidarbha region of Maharashtra. This is the epicentre of farmer suicides in the country and in addition to the farm distress, since the last few years, farmers are challenged by pests like the pink bollworm (larvae of the moth Pectinophora gossypiella) on cotton which is assuming menacing proportions. This year too, farmers have noticed with alarm, an early onset of the pest.

The pink bollworm has not caused much trouble in India unlike the green or American bollworm (Helicoverpa armigera) which used to devastate cotton. Bt cotton, a genetically modified pest resistant variety, was launched to tackle the green bollworm in 2002. However, last year (2017), pink bollworm damage was widespread in Maharashtra and many farmers are still waiting for the compensation announced by the government. This pest has added to the complex theatre of distress in Yavatmal.

Pesticide poisoning


Cotton has been grown in Yavatmal for over 100 years and the cotton acreage keeps fluctuating, but it is the mainstay of the local economy. Since 2002, farmers adopted Bt cotton in a big way and now they also plant herbicide tolerant Bt cotton which is as yet illegal in the country and has not been approved for planting. In 2017, the sudden increase in pests, mainly the pink bollworm from July onwards prompted intensive chemical spraying which resulted in 22 deaths in Yavatmal district and over 60 overall in the state.

In the government hospital at Yavatmal alone there were 507 admissions and 13 deaths, according to official figures. There were extensive crop losses due to the pink bollworm and this year, the cotton area has reduced to between 3.6 million and 3.8 mha compared to 4.2 mha in 2017-18 in Maharashtra, according to the Central Institute for Cotton Research (CICR).

The effects of spraying a dangerous mix of chemicals are being felt already and there have been 72 admissions in the Yavatmal government hospital till August 28 this year, with five new admissions on that day. There are 22 persons in the ward, with six critically ill and one on a ventilator. So far 50 have been discharged.

The doctors said the patients do not use safety kits and tend to use organophosphates and weed killers, which have an impact on their body. Prompted by last year's influx, the hospital dean, Dr. Man Shrigiriwar has set up a special unit for inhalation and contact poisoning patients and closely monitors their progress.

Battling the pink bollworm

After last year's debacle, for the first time, the Punjabrao Deshmukh Krishi Vidyapeeth, Akola, has set up a zone-wise monitoring committee for the pink bollworm in Vidarbha this year, said Yadgiriwar, who heads the committee for central Vidarbha. The committees have been active in all 11 districts of the region since July and will continue their work till February of next year. There were few instances of the pink bollworm crossing the economic threshold level (ETL), he said. Only two villages in Pusad and Umerkhed talukas of Yavatmal district had reported that and now, towards August end, the pest was under control in those places. He advised using light traps for 2-3 hours early morning and after dusk.

The danger with light traps which are supposed to attract the small grey moths of Pectinophora gossypiella, whose larvae is the pink bollworm, is that they are left on all day and night. The traps attract all kinds of insects and moths, killing the beneficial ones as well. CICR has advocated that light traps must be kept only next to gins, to attract moths, and not on fields. However, this advice seems to have fallen on deaf ears.

The making of an "insecticide resistant monster" 

Studies by CICR in 2015 had already established that the pink bollworm had developed resistance to the pesticide Bollgard 2. Lack of alternatives to Bt cotton which seems to have a diminishing impact on pests along with a lack of proper advice on dealing with pests, has left farmers to bear the brunt of crop loss and debt.

V.N. Waghmare, director (acting), CICR, said since last year, the pink bollworm has developed resistance but this is not uniformly distributed, it is low in some places and higher in irrigated areas. Extending the cotton crop beyond December or mid-January has also contributed to increasing the pest attack. The CICR is advocating spraying neem based pesticides, avoiding chemicals in the beginning and spraying synthetic pyrethroids only after 120 days.

Waghmare said the pink bollworm is a minor pest usually occurring in October and it has a life cycle of 30 to 35 days. Usually it has 1 or 2 life cycles but since the cotton lasts till April in most places, its life cycle continues, he pointed out.Uncontrolled spraying of synthetic pyrethroids made the American or green bollworm an "insecticide resistant monster", as former CICR director K.R. Kranthi described it. Not having learnt any lessons, we seem to be headed in a similar direction for the pink bollworm. Meanwhile the farmers suffer.

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Sanjay Rathod,Lasina,proclaimed,Vidyapeeth,economic,American

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