A plane conducting the aerial spraying of pesticides, flies over a swarm of desert locusts in Lemasulani village, Samburu County, Kenya January 17, 2020. Picture taken January 17, 2020. REUTERS/Njeri Mwangi

A plane conducting the aerial spraying of pesticides, flies over a swarm of desert locusts in Lemasulani village, Samburu County, Kenya January 17, 2020. Picture taken January 17, 2020. REUTERS/Njeri Mwangi

A man uses a Monsanto's Roundup weedkiller spray containing glyphosate in a garden in Bordeaux, France, June 1, 2019. REUTERS/Regis Duvignau

A man uses a Monsanto's Roundup weedkiller spray containing glyphosate in a garden in Bordeaux, France, June 1, 2019. REUTERS/Regis Duvignau

A man holds a Monsanto's Roundup weedkiller spray containing glyphosate in a garden in Bordeaux, France, June 1, 2019. REUTERS/Regis Duvignau

A man uses a Monsanto's Roundup weedkiller spray containing glyphosate in a garden in Bordeaux, France, June 1, 2019. REUTERS/Regis Duvignau

A man uses a Monsanto's Roundup weedkiller spray containing glyphosate in a garden in Bordeaux, France, June 1, 2019. REUTERS/Regis Duvignau

A sticker on the bottle of Monsanto's Roundup weedkiller spray containing glyphosate is pictured in Bordeaux, France, June 1, 2019. REUTERS/Regis Duv

A farmer shows army worms that he picked in his maize field in Chikwawa District, Malawi March 19, 2018. Picture taken March 19, 2018. REUTERS/Eldson Chagara

A local farmer shows the moths that he captured in his maize field in Chikwawa District, Malawi March 19, 2018. Picture taken March 19, 2018. REUTERS/Eldson Chagara

A local farmer pours Neem leaves concoction into a sprayer in her village in Chikwawa District, Malawi March 19, 2018. Picture taken March 19,2018. REUTERS/Eldson Chagara

A farmer picks an army worm in his maize field in Chikwawa District, Malawi March 19, 2018. Picture taken March 19, 2018. REUTERS/Eldon Chagara

A farmer displays army worms that he picked in his maize field in Chikwawa District, Malawi March 19, 2018. Picture taken March 19, 2018. REUTERS/Eldson Chagara

Public health workers spray insecticide on a rain water pool amid fears of a new cholera outbreak in Sanaa, Yemen, June 4, 2018. REUTERS/Khaled Abdullah

A woman uses a Monsanto's Roundup weedkiller spray without glyphosate in a garden in Ercuis near Paris, France, May 6, 2018. REUTERS/Benoit Tessier

French farmer Marc Leprince pulls up a dead weed in an alfalfa field non-treated with weedkillers during an interview with Reuters in Greneville-en-Beauce, France, November 30, 2017. Picture taken November 30, 2017. REUTERS/Christian Hartmann

French farmer Marc Leprince shows a dead weed in an alfalfa field non-treated with weedkillers during an interview with Reuters in Greneville-en-Beauce, France, November 30, 2017. Picture taken November 30, 2017. REUTERS/Christian Hartmann

French farmer Marc Leprince pulls up a dead weed in an alfalfa field non-treated with weedkillers during an interview with Reuters in Greneville-en-Beauce, France, November 30, 2017. Picture taken November 30, 2017. REUTERS/Christian Hartmann

French farmer Herve Fouassier pulls up a dead weed as he demonstrates the impact of using the weedkiller glyphosate in a mustard field during an interview with Reuters in Ouzouer-sous-Bellegarde, France, November 30, 2017. Picture taken November 30, 2017. REUTERS/Christian Hartmann

French farmer Herve Fouassier demonstrates the impact of using the weedkiller glyphosate in a mustard field during an interview with Reuters in Ouzouer-sous-Bellegarde, France, November 30, 2017. Picture taken November 30, 2017. REUTERS/Christian Hartmann

A can of glyphosate weedkiller is seen in a treated mustard field as French farmer Herve Fouassier attends an interview with Reuters in Ouzouer-sous-Bellegarde, France, November 30, 2017. Picture taken November 30, 2017. REUTERS/Christian Hartmann

A tractor with a pulveriser system is seen in a mustard field treated with the weedkiller glyphosate as French farmer Herve Fouassier attends an interview with Reuters in Ouzouer-sous-Bellegarde, France, November 30, 2017. Picture taken November 30, 2017. REUTERS/Christian Hartmann

A can of glyphosate weedkiller is seen as French farmer Herve Fouassier attends an interview with Reuters in Ouzouer-sous-Bellegarde, France, November 30, 2017. Picture taken November 30, 2017. REUTERS/Christian Hartmann

A tractor with a pulveriser system is seen in a mustard field treated with the weedkiller glyphosate as French farmer Herve Fouassier attends an interview with Reuters in Ouzouer-sous-Bellegarde, France, November 30, 2017. Picture taken November 30, 2017. REUTERS/Christian Hartmann

A can of glyphosate weedkiller is seen in front of a tractor with a pulveriser system as French farmer Herve Fouassier attends an interview with Reuters in Ouzouer-sous-Bellegarde, France, November 30, 2017. Picture taken November 30, 2017. REUTERS/Christian Hartmann

French farmer Herve Fouassier handles a can of glyphosate weedkiller during an interview with Reuters in Ouzouer-sous-Bellegarde, France, November 30, 2017. Picture taken November 30, 2017. REUTERS/Christian Hartmann

French farmer Herve Fouassier handles a can of glyphosate weedkiller during an interview with Reuters in Ouzouer-sous-Bellegarde, France, November 30, 2017. Picture taken November 30, 2017. REUTERS/Christian Hartmann

French farmer Herve Fouassier inspects his tractor with a pulveriser system in a mustard field treated with the weedkiller glyphosate during an interview with Reuters in Ouzouer-sous-Bellegarde, France, November 30, 2017. Picture taken November 30, 2017. REUTERS/Christian Hartmann

Monsanto's Roundup weedkiller atomizers are displayed for sale at a garden shop near Brussels, Belgium November 27, 2017. REUTERS/Yves Herman

Monsanto's Roundup weedkiller atomizers are displayed for sale at a garden shop near Brussels, Belgium November 27, 2017. REUTERS/Yves Herman

Monsanto's Roundup weedkiller atomizers are displayed for sale at a garden shop near Brussels, Belgium November 27, 2017. REUTERS/Yves Herman

Monsanto's Roundup weedkiller atomizers are displayed for sale at a garden shop near Brussels, Belgium November 27, 2017. REUTERS/Yves Herman

Monsanto's Roundup weedkiller atomizers are displayed for sale at a garden shop near Brussels, Belgium November 27, 2017. REUTERS/Yves Herman

Farmer Edward Ford poses for a photograph in a barley field which he sprays with the weedkiller glyphosate on his arable farm in Brentwood, Britain November 7, 2017. REUTERS/Mary Turner

Farmer Edward Ford walks on his arable farm which he sprays with the weedkiller glyphosate, in Brentwood, Britain November 7, 2017. REUTERS/Mary Turner

Farmer Edward Ford holds up a barley seed as he demonstrates the impact of using the weedkiller glyphosate on his arable farm in Brentwood, Britain November 7, 2017. REUTERS/Mary Turner

Farmer Edward Ford demonstrates the use of the weedkiller glyphosate on his arable farm in Brentwood, Britain November 7, 2017. REUTERS/Mary Turner

Farmer Edward Ford holds up a barley seed as he demonstrates the impact of using the weedkiller glyphosate on his arable farm in Brentwood, Britain November 7, 2017. REUTERS/Mary Turner

Farmer Edward Ford pulls up a dead weed as he demonstrates the impact of using the weedkiller glyphosate on his arable farm in Brentwood, Britain November 7, 2017. REUTERS/Mary Turner

Farmer Edward Ford poses for a photograph in a barley field which he sprays with the weedkiller glyphosate on his arable farm in Brentwood, Britain November 7, 2017. REUTERS/Mary Turner

Farmer Edward Ford demonstrates granules of the weedkiller glyphosate on his arable farm in Brentwood, Britain November 7, 2017. REUTERS/Mary Turner

Farmer Edward Ford demonstrates granules of the weedkiller glyphosate on his arable farm in Brentwood, Britain November 7, 2017. REUTERS/Mary Turner

Farmer Edward Ford walks past dead weeds on his arable farm where he relies heavily on the use of the weedkiller glyphosate, in Brentwood, Britain November 7, 2017. REUTERS/Mary Turner

Farmer Edward Ford carries a can of glyphosate weedkiller through his arable farm in Brentwood, Britain November 7, 2017. REUTERS/Mary Turner

People pull a model of a Roundup weedkiller atomizer during a protest against a planned $66 billion takeover of U.S. seeds company Monsanto by Bayer, outside the European Commission headquarters in Brussels, Belgium July 19, 2017. REUTERS/Yves Herman

People pull a model of a Roundup weedkiller atomizer during a protest against a planned $66 billion takeover of U.S. seeds company Monsanto by Bayer, outside the European Commission headquarters in Brussels, Belgium July 19, 2017. REUTERS/Yves Herman

People pull a model of a Roundup weedkiller atomizer during a protest against a planned $66 billion takeover of U.S. seeds company Monsanto by Bayer, outside the European Commission headquarters in Brussels, Belgium July 19, 2017. REUTERS/Yves Herman

Monsanto's Roundup weedkiller atomizers are displayed for sale at a garden shop at Bonneuil-Sur-Marne near Paris, France, June 16, 2015. REUTERS/Charles Platiau/File Photo

Monsanto's Roundup weedkiller atomizers are displayed in the company headquarters in Morges, Switzerland, May 25, 2016. REUTERS/Denis Balibouse/File Photo

Monsanto's Roundup weedkiller atomizers are displayed in the company headquarters in Morges, Switzerland, May 25, 2016. REUTERS/Denis Balibouse

Monsanto's Roundup weedkiller atomizers are displayed in the company headquarters in Morges, Switzerland, May 25, 2016. REUTERS/Denis Balibouse

Monsanto's Roundup weedkiller atomizers are displayed in the company headquarters in Morges, Switzerland, May 25, 2016. REUTERS/Denis Balibouse

Monsanto's Roundup weedkiller atomizers are displayed in the company headquarters in Morges, Switzerland, May 25, 2016. REUTERS/Denis Balibouse

Monsanto's Roundup weedkiller atomizers are displayed for sale at a garden shop at Bonneuil-Sur-Marne near Paris, France, June 16, 2015. REUTERS/Charles Platiau/File Photo

Monsanto's Roundup weedkiller atomizers are displayed for sale at a garden shop at Bonneuil-Sur-Marne near Paris, France, June 16, 2015. REUTERS/Charles Platiau

Monsanto's Roundup weedkiller atomizers are displayed for sale at a garden shop at Bonneuil-Sur-Marne near Paris, France in this June 16, 2015 file photo. REUTERS/Charles Platiau/Files GLOBAL BUSINESS WEEK AHEAD PACKAGE- SEARCH 'BUSINESS WEEK AHEAD APRIL 4' FOR ALL IMAGES

A health agent uses pesticide next to Brazilian soldiers as they conduct an inspection for the Aedes aegypti mosquito in Rio de Janeiro, Brazil, February 15, 2016. REUTERS/Sergio Moraes

A municipal worker sprays insecticide at the neighborhood of Imbiribeira in Recife, Brazil, January 26, 2016. The operation is part of the city's effort to prevent the spread of Zika's vector, the Aedes aegypti mosquito, according to a statement from Municipal Health Secretary. REUTERS/Ueslei Marcelino

A Palestinian farmer sprays farm chemicals on a tree in a field at the former Jewish settlement of Neve Dekalim, in Khan Younis in the southern Gaza Strip August 6, 2015. Picture taken August 6, 2015. To match Insight ISRAEL-GAZA/DISENGAGEMENT REUTERS/Ibraheem Abu Mustafa

CEO Michael Mack of Swiss agrochemicals maker Syngenta leaves after a news conference to present the half-year results in Basel July 23, 2015. Syngenta and unwanted suitor Monsanto squabbled over an earnings report from the Swiss pesticides maker on Thursday, with both sides claiming it strengthened their case in a $45 billion takeover battle. REUTERS/Arnd Wiegmann