Cotton

Calculate Expected Square/Fruit Retention

To find the expected square/fruit retention, evaluate results from your lygus and square/fruit retention sampling. The values you need are:

  • Total number of fruiting branches.
  • Percent fruit retention on both the bottom and top 5 fruiting branches.

This calculator will compare your sampled percent retention for the top 5 first position squares with an expected value based on research.

Compare sampled fruit retention with expected fruit retention

  1. Enter the average number of fruiting branches per plant in your field:  
  2. Enter the average percent retention of first position fruit on the bottom 5 fruiting branches:  
  3. Enter the average percent retention of first position fruit on the top 5 fruiting branches:  

You may also use this table to determine the expected percent retention.

Expected retention (%) of the first position fruit on the top 5 fruiting branches, from data for Acala cotton.
 
Total
Fruiting
Branches
Percent retention of the first position fruit on the BOTTOM 5 fruiting branches
102030405060708090100
Less than 5 The expected retention of the top 5 first fruiting positions is 73%. The retention on the first fruiting branch is erratic and at least 3 branches should be present before lygus decisions are made.
573737373737373737271
673737373737372727069
773737373737271706865
873737373727169666360
973737271706865625853
1073727169676560565146
1171706866625854494439
1269676461565146413732
1366635954494439353027
1461575247423733292522
1555504540353127242118
1648433833292522201816
1740363128242119171514
1834292623201816141312
1928242119171514131211
2023201816151312111110

Statewide IPM Program, Agriculture and Natural Resources, University of California
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