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Intractable Weed Problems Need Innovative Solutions Using All Available Technologies Indian Journal of Weed Science 50(3): 201–208, 2018 Print ISSN 0253-8040 Online ISSN 0974-8164 Intractable weed problems need innovative solutions using all available technologies Jonathan Gressel* Plant & Environmental Sciences, Weizmann Institute of Science, Rehovot, 76100 Israel *Email: jonathan.gressel@weizmann.ac.il Article information ABSTRACT DOI: 10.5958/0974-8164.2018.00049.7 There is often strong public dissent to innovations, typically fanned by those who lose out economically, but the reasons they promulgate are not economic Type of article: Review article and are targeted to public emotions. Agriculture has some problems that have Received : 29 September 2018 been intractable to present technologies and we have no choice but to utilize Revised : 03 October 2018 new technologies to overcome them. These include developing new herbicides Accepted : 16 October 2018 that affect multiple targets, new selective synergists and safeners, transgenic herbicide resistant plants that will not have the transgenes expressed in related weeds, using transposons or gene drives to disseminate deleterious genes in Key words weeds, sterile pollen, enhanced-virulence biocontrol agents with sustaining Gene drives formulations. These might be workable for multiple resistant Amaranthus and Herbicide resistance Herbicide safeners Echinochloa species, parasitic weeds, Phalaris in wheat as well as weedy rice Herbicide synergists in rice. Per force, most of the innovations must originate in the public sector, by Innovation weed scientists who have a broad training in basic sciences, in collaboration Multisite herbicides with experts from other fields. Transgenics INTRODUCTION resist new technologies” (Juma 2016), he describes Innovation and its enemies the many types of detractors of new technologies. They are all typically vested interests that will be the There are a growing number of seemingly economic or political losers if the technology is intractable weed problems that are globally prevalent adopted. They never tell you that their reason is their on a large scale, as discussed in the following pocket book; they make up lies such as it is unsafe, sections. The present solutions are often not realistic will cause cancer, impotence, is unnatural, scientists solutions, as they may include compromises such as are playing God, etc., etc., all targeted to achieve a lower yield, more costly or expensive herbicides, or hysterical response in the media, and an emotional more environmentally-degrading cultivations, negative response in the public. He points out that the growing alternative less effected but lower yielding general public typically is more convinced by varieties or other crop species that are less pseudoscience over science. appropriate. Innovative solutions may be out there already, or can be conceived and tested but are not – Juma describes how these detractors may come because too many weed scientists feel uncomfortable from very different ends of the spectrum. In our case when out of the box, lack the basic knowledge on dealing with innovations in weed control they include: which to base innovation and/or are reluctant to - So-called environmental activists who need a collaborate with colleagues in other areas who could target around which to garner financial contributions assist, as well as the many that fear the wrath of by generating hysteria – whether about herbicides or detractors who view innovation as a threat. transgenics. A book that is required reading for anyone - It includes those who have anti-globalization interested in being an innovator was written by the politics and are against multinational corporations. late Kenya native, Harvard University Professor of the - It includes NGOs that want to keep the poor Practice of International Development, Calestous impoverished so that they can stay in business. Juma. In “Innovation and its Enemies: Why people 201 Intractable weed problems need innovative solutions using all available technologies - It includes organic growers and their lobbyists to become global crops. Some weed species also who do not like seeing conventional growers using have the genetic diversity to be camp followers and more cost-effective systems. have evolved to cover most of the same agro- - Last but not least in this unholy alliance are the ecosystems as the crops they follow. Unfortunately, chemical companies who make far less profits from this same genetic diversity has allowed some of these seeds, or herbicides with synergists and protectants, weeds to evolve resistance to all our efforts, whether than high rate herbicides. breeding, cultivation technologies, or herbicides. Herbicides are the last major innovation to be - The detractors are supported by an eminent developed in this continual evolutionary race, and no (but misogynist) economist who claimed that the use new major mode of action has been released in of glyphosate resistant maize in Africa is a bad idea decades, and the weeds have caught up, including to because it will take jobs (hand weeding) away from the mutational and transgenic development of new women. herbicide selectivities. Examples are discussed below. Still – innovations do get adopted, as Juma Echinochloa species points out – there is always someone wise enough to accept them. A local case in point is Bt brinjal, Echinochloa species are especially prevalent in developed in India that replaces huge levels of rice and maize where they had been effectively insecticide. It is being grown in Bangladesh but controlled for half a century by herbicides. They have banned in India. evolved either metabolic or target-site resistance to herbicides having ten modes of action, especially in This author is old enough to remember all those rice (Heap 2018). who were against the innovative green revolution in rice and wheat. There are still detractors claiming that Amaranthus spp it was a failure, but how many millions or billions of Amaranthus spp, which cross among lives were saved by from starvation this counterin- themselves have evolved resistances to almost all the tuitive innovation? herbicides that had previously controlled them (Heap There has never been an agricultural innovation 2018). Farmers are having to perform more erosion that has been sustainable forever. They all have and causing tillage and other costly programs with only will have problems because weeds evolve. Let us partial success. A major part of the problem was remember that the green revolution was predicated on injudicious over and repeated use of the same having adequate methods of selective weed control. herbicide until resistance evolved, then another was If not for these chemicals, breeders would still be used, and then another, as each fell by the wayside to breeding taller and taller wheat and rice, ignoring that the inevitable forces of evolution. There are many the weeds co-evolve to be taller and taller. workable strategies that could have delayed this Detractors often lobby regulators that they evolution, but farmers were not willing to adopt them, should demand absolute proof of safety from new often following the advice of salespeople who innovations, knowing full well that this is impossible. assured the farmers that should resistance evolve, Safety assessments should be relative – is the industry would develop new compounds. innovation as safe or safer than currently used Root-attaching parasitic weeds technologies used for the same purpose? If it meets those standards, farmers should be given the option Striga species are widely spread throughout of choice. In summary, we should not be afraid of sub-Sahara Africa, especially on maize, the millets, being innovative – just be cognizant of the sorghum, and recently in wheat. Orobanche/ impediments that have little to do with our science. Phelipanche species are prevalent on all solonaceous, We must also conceive strategies that better explain legume and umbelliferous crops as well as the value and safety of our innovations that will sunflowers in northern Africa, the Middle East, preempt the detractors. The intractable weed southern and eastern Europe and to a lesser extent in problems, if not dealt with – threaten world food India. They were never selectively controlled by security. It is an existential matter of life or death. herbicides while still underground. The parasites inflict sufficient crop damage that it is uneconomical Examples of major weed problems to control them after they emerge. Farmers could not We now have four species that supply 80% of afford to do so to prevent seed set and spread, the calories for humans and their livestock: rice, exacerbating the situation. Most of the claimed wheat, maize and soy. They had the genetic diversity successes with breeding have been transient; the 202 Jonathan Gressel parasites evolve too quickly. These weeds are the pathways, there could be no selective herbicides that subject of a recent book that discusses all aspects control weedy rice. When mutant imidazolinone- about them and their control (Joel et al. 2013). resistant rice was introduced to control weedy rice, the trait was rapidly rendered worthless for weedy Phalaris in wheat rice control because it crossed into weedy rice. The Phalaris species have evolved metabolic and same will happen when transgenic herbicide target-site resistances to many herbicides globally in resistance is introduced (Zhang et al. 2018), unless the semi-arid regions where wheat is grown (Heap innovative measures are taken to mitigate transgene 2018). The situation is especially acute in India with flow to weedy rice. The imidazolinone-resistant rice Phalaris minor (Chhokar and Sharma 2008), due to a was effective for Echinochloa spp control for a special agro-ecosystem that exacerbates the problem. longer period, but this weed too mutated to Contrary to what some scientists claim, Phalaris was resistance. In parts of the world where they have not recently introduced to India on foreign grain – it considerable amounts of available land, crop rotation has been in India since it was inadvertently brought together with using certified rice seed became the by the Moghuls centuries ago when they introduced control method for weedy rice.
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