That treatment gave the highest net benefit with acceptable marginal return.

mancozeb · yield · Allium cepa (onion)Results differ

8 papers in the same direction as this claim · 1 in the opposite direction

1. no effect
   Mancozeb and untreated onions showed no significant difference in measured yield components.

   Reduction of Onion Yields by Chlorothalonil1 · 1982 · compared with untreated check

   Opposite direction

2. positive
   Mancozeb treatment increased yield by 60% in 1990.

   Control of onion downy mildew in the presence of phenylamide-resistant strains of Peronospora destructor (Berk.) Caspary · 1992

   Same direction

3. positive
   Granosan 200 dust increased yield by 106%.

   Chemical Control of Basal Rot of Onion in Zambia · 1981

   Same direction

4. positive
   Mancozeb plus monochrotophos yielded 1844.44 kg/ha of onion seed versus 893.33 kg/ha for the check.

   Management of purple blotch and Stemphylium blight of onion in Tarai and Bhabar regions of Uttarakhand, India · 2016 · compared with check

   Same direction

5. positive
   The coating increased seed yield per plant to 21.15 g.

   Polymer coating for higher pesticide use efficiency, seed yield and quality in onion (Allium cepa) · 2019 · compared with control and traditional method of bulb treatment

   Same direction

6. positive
   Mancozeb spray gave 10.57 t/ha bulb yield, significantly above other treatments.

   Efficacy of Botanicals, Bioagents and Fungicides on Management of Leaf Blight (Altbrnaria Porri) of Onion. · 2008

   Same direction

7. positive
   Combined bulb dip and sprays produced maximum seed yield of 1022 kg/ha.

   Management of bulb rot of onion caused by Erwinia carotovora pv. carotovora · 2020 · compared with rest of the treatments

   Same direction

8. positive
   These three fungicides increased onion seed and bulb yield by 82–111% over control.

   EVALUATION OF FUNGICIDES FOR CONTROLLING DOWNY MILDEW AND PURPLE BLOTCH DISEASES OF ONION · 1995

   Same direction

1 paper more in this group

metalaxyl · yield · Allium cepa (onion)Positive and negative results

1 paper in the same direction as this claim · 1 in the opposite direction

1. no effect
   Metalaxyl did not differ from the check in onion yield.

   Control of onion downy mildew in the presence of phenylamide-resistant strains of Peronospora destructor (Berk.) Caspary · 1992 · compared with check treatment

   Opposite direction

2. positive
   Metalaxyl onion yields were 18.96 and 19.14 ton/fed in consecutive seasons.

   Effects of Pesticide Treatments and Sowing Dates on Growth Parameters and Yield of Onion Plant (Allium Cepa L.) · 2012 · compared with control

   Same direction

fungicide · yield · Allium cepa (onion)Positive and negative results

11 papers in the same direction as this claim · 1 in the opposite direction

1. no effect
   The threshold spray program caused no significant onion yield reduction.

   Quantification of Airborne Inoculum as an Aid in the Management of Leaf Blight of Onion Caused by Botrytis squamosa · 2005 · compared with grower's schedule

   Opposite direction

2. positive
   Synthetic and botanical fungicide application gave a higher shallot yield

   Effectiveness of the Ageratum (Ageratum conyzoides) Leaf Extract as Botanical Fungicide Against Twisted Disease of Shallot · 2020

   Same direction

3. positive
   Folicure increased field bulb yield by 119.4%.

   Performance of some Environmental Safe Treatments on Controlling Onion White Rot · 2015

   Same direction

4. positive
   Soil solarization combined with the used fungicides also reduced onion yield losses in treated fields.

   Soil Solarization Combined with Commercial Fungicides for Controlling of Onion and Garlic White Rot Disease · 2022

   Same direction

5. positive
   Fungicide treatments increased onion yield by 1.3—6.9 t/ha through reduced disease damage.

   Fungicidal control of the most common onion mycoses during the growing season · 2023

   Same direction

6. positive
   Two fungicide sprays with 25 cm spacing yielded onion production of seeds of 423.63 kg.ha-1..

   QUANTITATIVE STUDIES ON DOWNY MILDEW Peronospora destructor AFFECTING ON GROWTH AND ONION SEED PRODUCTION IN UPPER EUPHRATES AREA · 2017

   Same direction

7. positive
   Fungicides were the most effective treatments in increasing onion yield.

   COMPARISON BETWEEN THE EFFECT OF SOME PESTICIDES , BIOCIDES AND BIOAGENTS IN CONTROLLING ONION WHITE ROT DISEASE CAUSED BY Sclerotium cepivorum (BERK) · 2009

   Same direction

8. positive
   Alternate fungicide applications gave a higher marginal rate of return than unprotected plots.

   Management of Onion Rust through Host Resistance and Alternate Application of Fungicides in Adjara,Georgia · 2022 · compared with unprotected plots

   Same direction

4 papers more in this group