Yesterday, I was at engineering hostel. One of the peculiar thing I observed there was visible memory loss in young boys in their early 20s. They start with the topic or poem or shayari and sudden forgetfulness.

Not their fault. Blame pesticides laden food. We can train memory, improve it with practice but it won’t last. It won’t become your स्वभाव. The culprit is food. Our food is loaded with mental blockers. Not only food, our water and air are also loaded with toxic chemicals.

Read this research to realize it. How pesticides impairs bees.


Quantifying the impact of pesticides on learning and memory in bees

  1. Most insecticides are insect neurotoxins. Evidence is emerging that sublethal doses of these neurotoxins are affecting the learning and memory of both wild and managed bee colonies, exacerbating the negative effects of pesticide exposure and reducing individual foraging efficiency.
  2. Variation in methodologies and interpretation of results across studies has precluded the quantitative evaluation of these impacts that is needed to make recommendations for policy change. It is not clear whether robust effects occur under acute exposure regimes (often argued to be more field‐realistic than the chronic regimes upon which many studies are based), for field‐realistic dosages, and for pesticides other than neonicotinoids.
  3. Here we use meta‐analysis to examine the impact of pesticides on bee performance in proboscis extension‐based learning assays, the paradigm most commonly used to assess learning and memory in bees. We draw together 104 (learning) and 167 (memory) estimated effect sizes across a diverse range of studies.
  4. We detected significant negative effects of pesticides on learning and memory (i) at field realistic dosages, (ii) under both chronic and acute application, and (iii) for both neonicotinoid and non‐neonicotinoid pesticides groups.
  5. We also expose key gaps in the literature that include a critical lack of studies on non‐Apis bees, on larval exposure (potentially one of the major exposure routes), and on performance in alternative learning paradigms.
  6. Policy implications. Procedures for the registration of new pesticides within EU member states now typically require assessment of risks to pollinators if potential target crops are attractive to bees. However, our results provide robust quantitative evidence for subtle, sublethal effects, the consequences of which are unlikely to be detected within small‐scale prelicensing laboratory or field trials, but can be critical when pesticides are used at a landscape scale. Our findings highlight the need for long‐term postlicensing environmental safety monitoring as a requirement within licensing policy for plant protection products.

A large-scale study published by researchers from Royal Holloway University of London has drawn together the findings of a decade of agrochemical research to confirm that pesticides used in crop protection have a significant negative impact on the learning and memory abilities of bees. The study is published in the Journal of Applied Ecology today.

Their research reveals that even at very low field-realistic dosages, pesticides have significant negative effects on bee learning and memory, with worker bees exposed to pesticides less likely to learn and memorise a rewarding scent. Learning abilities are a vital component of the search for food in bees, because individuals must remember what type of flowers to visit, where to find them, which flowers they have recently drained of nectar, and how to find the way back to the hive.

Harry Siviter said: “Policy makers need robust information about the impact of insecticides on pollinators if they are to develop appropriate regulation for sustainable bee health”.

“Our results show that, when combining data collected from a wide range of studies, insecticides have a significant negative impact on bee learning and memory. This occurs even at the low levels of pesticides that bees would routinely encounter in the field.

“Importantly, as the near-total European ban on neonicotinoid insecticides is set to be implemented in December this year, our results showed that non-neonicotinoid insecticides also have a robust significant negative impact on bee learning and memory.

“Our findings therefore highlight the need for policy makers and regulators to increasingly consider the sub-lethal impacts of insecticides on important pollinators such as bees.”