Abstract
Abstract Bt cotton remains one of the most widely grown biotech crops among smallholder farmers in lower income countries, and numerous studies attest to its advantages. However, the effectiveness of Bt toxin, which depends on many technical constraints, is heterogeneous. In Pakistan, the diffusion of Bt cotton occurred despite a weak regulatory system and without seed quality control; whether or not many varieties sold as Bt are in fact Bt is also questionable. We utilise nationally representative sample data to test the effects of Bt cotton use on productivity. Unlike previous studies, we invoke several indicators of Bt identity: variety name, official approval status, farmer belief, laboratory tests of Bt presence in plant tissue, and biophysical assays measuring Bt effectiveness. Only farmer belief affects cotton productivity in the standard production model, which does not treat Bt appropriately as damage‐abating. In the damage control framework, all Bt indicators reduce damage from pests. Biophysical indicators have the largest effect and official approval has the weakest. Findings have implications for impact measurement. For policy‐makers, they suggest the need, on ethical and productivity grounds, to improve variety information and monitor variety integrity closer to point of sale.
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Claims 5
Claim · model-written summary
In the standard production model, only farmer belief affects cotton productivity.
- Taxon
- cotton
Gossypium hirsutume2 - Treatment
- farmer beliefe2
- Outcome
- cotton productivitye2
- Setting
- Pakistane6
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Only farmer belief affects cotton productivity in the standard production model”
e6“In Pakistan, the diffusion of Bt cotton occurred despite a weak regulatory system”
Claim · model-written summary
In the damage control framework, all Bt indicators reduce damage from pests in cotton.
Verbatim
e1“We utilise nationally representative sample data to test the effects of Bt cotton use on productivity”
e3“In the damage control framework, all Bt indicators reduce damage from pests”
Claim · model-written summary
Biophysical indicators have the largest effect on Bt cotton damage control among the indicators.
Verbatim
e1“We utilise nationally representative sample data to test the effects of Bt cotton use on productivity”
e4“Biophysical indicators have the largest effect and official approval has the weakest”
Claim · model-written summary
Official approval of Bt cotton varieties has the weakest effect among the indicators.
Verbatim
e1“We utilise nationally representative sample data to test the effects of Bt cotton use on productivity”
e4“Biophysical indicators have the largest effect and official approval has the weakest”
Claim · model-written summary
Policy-makers should improve variety information and monitor Bt cotton variety integrity closer to point of sale.
Verbatim
e1“We utilise nationally representative sample data to test the effects of Bt cotton use on productivity”
e5“to improve variety information and monitor variety integrity closer to point of sale”