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Pesticides in Agriculture


Feeding growing numbers of people whilst avoiding damage to the environment remains one of agriculture's greatest challenges. It is a challenge that should bring together scientists from industry, representatives of agrochemical companies, environmentalists, international organizations and of course farmers. All these should be involved in searching for practical and sustainable solutions. The reality, however, falls a long way short of this ideal. Differing assessments of future development, prejudices and commercial interests lock many of the parties in sometimes bitter and fruitless discussions that rule out the possibility of constructive talks. New Agriculturist offers some of the latest news and views from this on-going debate.


"Effective but toxic" are the attributes often associated with chemical products, and "environmentally friendly but of varying efficacy" the ones often applied to biological agents and methods. Given the properties of the measures that are available today, blanket judgements of this kind no longer stand up to careful scientific examination.
Dr Silvia Dorn, Prof. of Applied Entomology, (Swiss Federal Institute of Technology) Courier Agrochem Extra - Special Issue 1997 p.5.

Thanks to hybrid seeds, chemical fertilizers and pesticides, we have continued to crop the same 6 million square miles of land, even though we are feeding 80% more people, and giving them far more of the resource-costly calories (meat, milk and eggs). In effect, we have tripled the output of world agriculture since 1960 - without taking any more land from nature. High-yielding farming has not only saved land, it has saved the land with the most biodiversity.
D.T.Avery, (Director of Global Food Issues, Hudson Inst, Indianapolis, IN, USA) "Saving the planet with pesticides, biotechnology and European farm reform", BCPC Conference, Brighton, UK Nov. '97.

"We want to make sure the environment in which we farm today will be there in the next fifty years. A code of practice has been written which details how we must monitor our water use, detailing how much of a buffer strip there must be between our activities and the lake. We have employed an executive officer from the Kenya Flower Council who comes and audits the farm at least once every six months. We are also looking very closely at the types of pesticides we use and over the past few years we've reduced our pesticide use by about 40%".
Gary Tomlins, Homegrown Kenya Ltd - The Farming World, BBC World Service.

Pesticides and inorganic fertilizers have got us into a situation where farming looks like a 19th-century smokestack industry.
Jim Orson, (Director of the farmer-supported Morley Research Station, Norfolk, UK) New Scientist 17 Jan '98 p.18.

Communication and training for safe use of agrochemicals

In many countries in Europe, Integrated Crop Management is the phrase on the lips of leading agriculturists as they debate the best way forward for their business into the new Millennium. They are very aware of the many demands being made on farming by the various campaign groups, by the media, by politicians and by governments. They know they must respond to the consumers' desire for reliable harvests of healthful food at affordable prices. At the same time they must take account of the demands for a flourishing countryside, rich in wildlife and free from pollution from an energy and waste-efficient farming. Above all in their minds is the need to remain profitable.
Richard Trow-Smith, (British Agrochemicals Association Ltd.) Courier Agrochem Extra - Special Issue 1997 p.12.

"I think what we've seen, within the agricultural community, is a ground swell of concern towards care for the environment. We have to understand that the food industry is a global market and we will be extending plans for biodiversity across all quarters of the world that supply us with fruit and vegetables. Six years ago a policy of integrated crop management was started, which combines more of the organic side of crop production to reduce the impact, and to reduce the volume and range, of pesticides that are used on the land of our suppliers. Over the last few years we've tried to ensure that this is a dynamic approach in our care of the environment through biodiversity."
Geoff Spriegel, Technical Director, Sainsbury's - The Farming World, BBC World Service.

IPM is not a new concept, nor one which is easy to put into practice. Adaptation to specific local conditions and a high level of knowledge are generally considered to be essential prerequisites. And, despite all the definitions that have been given, IPM is not something static either, but is constantly developing.
Huub A.I. Stoetzer (International Agricultural Centre, Wageningen, Netherlands) Courier Agrochem Extra - Special Issue 1997 p.7.

We are all aware that the world population is rapidly growing and will reach ca. 8 billion in the year 2025. The actual global area of agricultural lands is approximately 1.5 bio ha. Because of ecological reasons the extension of the present area under agricultural production has to be strictly avoided in order to protect tropical forests and other natural and vulnerable habitats. The consequence from these simple facts is that we must double food production on less agricultural land in the next twenty years. Therefore the call for extensification of agriculture in countries of comfortable surpluses is irresponsible if the global situation is considered. Feeding the people of the world will require even more intensive agriculture.
Dr. Jochen Wulff, (Bayer AG), "Technological Opportunities for Sustainable Agricultural Development".

Using state of the art equipment and knowledge, 30 to 50 % of the pesticides actually sprayed in agriculture could be saved immediately without any change in the pest control concepts. In many countries the only specialists offering advice to farmers on application technology, handling and calibration of their equipment are the representatives of pesticide companies. Many farmers still believe that the use of high volumes, high pressures and high doses, is the most appropriate way to apply pesticides.
Theodore Friedrich, FAO Agricultural Engineering Branch quoted in 'Application in Asia'. Pesticides News 38 Dec.'97.

The IPM approach is not about using synthetic products last of all, but about weighing all available methods against each other and applying the most suitable one at the appropriate time.
Dr Silvia Dorn, Prof. of Applied Entomology, (Swiss Federal Institute of Technology) Courier Agrochem Extra - Special Issue 1997 p.6.

Crop spraying with facemask as only protection

Most farmers in the Philippines have not received formal training prior to their first contact with pesticides or application equipment. The state of equipment and lack of training led to the conclusion that applicators face a high level of pesticide exposure, particularly dermal (skin).
FAO Report on Safe and Efficient Application of Agrochemicals and Bioproducts quoted in "Application in Asia". Pesticides News 38 Dec.'97.

"When a plant becomes infected with pests or disease this tells us that we have done something wrong in the management of that crop. We like to treat pests and diseases not as problems but as teachers to show us exactly where we have gone wrong. If we cure the root cause of the problem then the pests and diseases will not come again. The insect infested plants and disease attacked plants here are very, very low - less than 2%. So pesticides are not necessary to kill them as all our activities here are preventative."
Monitosh Howlader, Bangladesh NGO, Proshika, The Farming World, BBC World Service.

Many people in industrialized countries do not understand the reality of agriculture. There is a widely accepted belief that 'high-yielding' or 'intensive agriculture' is not sustainable and produces food that is harmful to the consumer. The reason for this attitude towards agriculture is probably due to the fact that the majority of people cannot assess the economic values and benefits of modern agriculture. In other words, they are unable to balance risks and benefits properly.
Dr. Jochen Wulff, (Bayer AG), "Technological Opportunities for Sustainable Agricultural Development".

Most governments are well aware that estimated world-wide crop losses are still 35%. This is why they support the numerous institutions concerned with research, advisory activity, and training in the area of crop protection.
Huub A.I. Stoetzer (International Agricultural Centre, Wageningen, Netherlands) Courier Agrochem Extra - Special Issue 1997 p.7.

"The problem of resistance has been with us as long as we've had mechanisms to control pests and diseases, particularly in relation to using chemicals but now also in relation to using genes in biotechnology. When you have a way of controlling a pest, it in turn starts to look at ways of resisting that control."
Professor Ben Miflin, Director, IACR-Rothamsted, UK), The Farming World, BBC World Service.

A survey of pesticide application equipment owned by rice farmers in the Muda area of Malaysia found many shortcomings. In terms of functional performance, 44% had an efficiency of less than 75%. Lack of training, improper maintenance of spraying equipment and insufficient protective clothing are contributing to the poisoning of the spray operators with pesticides. Pesticide residues found in water were primarily due to excess pesticide use by farmers.
FAO Report on Safe and Efficient Application of Agrochemicals and Bioproducts quoted in "Application in Asia". Pesticides News 38 Dec.'97.

In today's agriculture crop protection products (CPPs) play an essential role. Oerke et al. surveyed the yield of the eight most important world crops in different regions. They concluded, that with today's level of crop protection, only 58% of available crop yields are obtained, 42% are still lost to diseases, insects and weeds, which could have been saved if optimal crop protection measures were taken.
Dr. Jochen Wulff, (Bayer AG), "Technological Opportunities for Sustainable Agricultural Development".

"Use of pesticides on farms in Africa, Asia and Latin America in growing flowers for export is exposing workers to unsafe working conditions and dangerous chemicals resulting in blindness, vomiting, respiratory problems, skin complaints and miscarriages in pregnant women. Most of these health problems are avoidable providing that proper safety procedures are followed including the wearing of protective clothing and not working with plants that have just been fumigated. Most of the manufacturer's recommendations continue to be ignored. Other health problems are caused by use of chemicals that are banned but continue to be used, even when less toxic alternatives are available."
The Farming World, BBC World Service quoting ICFTU report (International Confederation of Free Trade Unions) May '97.

Children assist spraying insecticides in cotton

India reported that hundreds of people die due to food poisoning each year. A survey of pesticide residues in food samples collected in 12 states found residues in 85% of samples, with 43% above the recommended doses - a possible indication that pesticides have not been used correctly.
FAO Report on Safe and Efficient Application of Agrochemicals and Bioproducts quoted in "Application in Asia". Pesticides News 38 Dec.'97.

"More farmers are aware that resistance to pesticides is an issue and that it is something that must be confronted. The important thing now is that there a number of new selective pesticides that are extremely useful and it's important that the same mistakes aren't made with these new pesticides as have been made with the old ones in the past. This means using them more wisely in a targeted and appropriate manner. It also means using them within a resistance management programme which might mean rotating different classes of chemistry so that any one class of chemistry isn't repeatedly used to avoid resistance to that class building up in the future."
Dr Matthew Cahill, (IACR-Rothamsted, UK) - The Farming World, BBC World Service.

In conservation tillage, herbicides take over the role of ploughing and harrowing. Only these chemicals make this environmentally-friendly method possible. In vulnerable areas in the USA, conservation tillage has reduced erosion by up to 95%. This technique has also been used with success in Brazil and Argentina, both on small and large farms threatened by erosion. Conservation tillage is estimated to increase the soil's organic content by 3-4% per decade. This contributes to a continuous improvement in soil fertility.
Dr. Jochen Wulff, (Bayer AG), Technological Opportunities for Sustainable Agricultural Development p.7.

"Resistance to propanil in jungle rice (Echnonchloa colona) is an increasing problem in Costa Rica. Alternative experimental strategies to combat the problem include the use of synergists - chemicals which, when mixed with pesticides, boost their effectiveness. The amount of propanil can be halved when used with synergists in field experiments."
Dr Bernal Valverde, (CATIE, Costa Rica) - The Farming World, BBC World Service.

A recent farming 'success' at the Rodale Institute achieved grain-equivalent yields from organic farming that were 21% lower, and required 42% more labour. If the whole world were to accept a 21% cut in its current grain yields, it would take an additional 147 million hectares of land to grow our current grain crops. That's 558,000 square miles, nearly equal to the total land area of Great Britain, Germany, France, Denmark, the Netherlands, Belgium and Italy. The public has been told the organic approach is "kinder to the environment". The public has not been told that its low yields would force us to destroy millions of square miles of additional wildlands.
D.T.Avery, (Director of Global Food Issues, Hudson Inst, Indianapolis, IN, USA) "Saving the planet with pesticides, biotechnology and European farm reform", BCPC Conference, Brighton, UK Nov. '97.

The high tech solution is to increase productivity of remaining land by pumping the ground full of chemical fertilizers and using machines to plough up compacted soil. Such methods, with fungicides and pesticides thrown in, have so far managed to feed most of the world's population, but not without enormous environmental and financial costs. No more than a quick fix that puts back nothing into the soil, these cannot continue indefinitely.
Meg Gordon quoting Stuart Pimm, (University of Tennessee, Knoxville, USA) New Scientist 17 Jan '98 p.30.

Protective clothing essential for crop spraying.

"Crop protection is both a challenging and rewarding business. Our products, services and technologies are among the most important tools used to achieve sustainability in agricultural production."
Wolfgang Samo, (Head of Agribusiness Division, Novartis Crop Protection), Carta Nova, The Charter of Novartis Crop Protection, February 1997.

It should be noted that the chemical industry is also working intensively to develop a range of products which meets present day requirements. Improved safety and environmental tolerability are being achieved through the use of less toxic products which work in new ways and act more specifically in the pest organism, have lower application rates, and come in better packaging.
Candida B. Adalla (Department of Entomology, Los Baños University, Philippines) Courier Agrochem Extra - Special Issue 1997 p.15.

The responsibility of a company making crop protection products does not end at the factory gates. As one of many measures, therefore, Bayer has decided to act locally in regions of the world where much still needs to be done. One example of this is the training campaign on Integrated Crop Management in Brazil, which is carried out together with a number of organizations.
Annick Dollacker, (Bayer AG), Courier Agrochem Extra - Special Issue 1997 p.16. Available in French, Spanish and English from Bayer AG, Landwirtschaftzentrum Monheim, 51368 Leverkusen, Bayerwerk, Germany.

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