diff --git a/app/models/activity.rb b/app/models/activity.rb
index 337b1782d0..c9aeba904d 100644
--- a/app/models/activity.rb
+++ b/app/models/activity.rb
@@ -131,8 +131,8 @@ class Activity < Ekylibre::Record::Base
   accepts_nested_attributes_for :distributions, reject_if: :all_blank, allow_destroy: true
   accepts_nested_attributes_for :inspection_point_natures, allow_destroy: true
   accepts_nested_attributes_for :inspection_calibration_scales, allow_destroy: true
-  accepts_nested_attributes_for :seasons, update_only: true, reject_if: -> (par) { par[:name].blank? }
-  accepts_nested_attributes_for :tactics, update_only: true, allow_destroy: true, reject_if: :all_blank
+  accepts_nested_attributes_for :seasons, allow_destroy: true, reject_if: -> (par) { par[:name].blank? }
+  accepts_nested_attributes_for :tactics, allow_destroy: true, reject_if: :all_blank
   accepts_nested_attributes_for :plant_density_abaci, allow_destroy: true, reject_if: :all_blank
   # protect(on: :update) do
   #   productions.any?
diff --git a/app/models/activity_season.rb b/app/models/activity_season.rb
index a46b298546..c44e46c0e5 100644
--- a/app/models/activity_season.rb
+++ b/app/models/activity_season.rb
@@ -33,11 +33,13 @@
 #
 class ActivitySeason < Ekylibre::Record::Base
   belongs_to :activity, class_name: 'Activity', inverse_of: :seasons
-  has_many :productions, class_name: 'ActivityProduction', inverse_of: :activity_season
+  has_many :productions, class_name: 'ActivityProduction', inverse_of: :season, foreign_key: :season_id
 
   # [VALIDATORS[ Do not edit these lines directly. Use `rake clean:validations`.
   validates :activity, presence: true
   # ]VALIDATORS]
 
-
+  protect(on: :destroy) do
+    productions.any?
+  end
 end
diff --git a/app/models/activity_tactic.rb b/app/models/activity_tactic.rb
index 4599556312..64dd089a34 100644
--- a/app/models/activity_tactic.rb
+++ b/app/models/activity_tactic.rb
@@ -54,5 +54,4 @@ class ActivityTactic < Ekylibre::Record::Base
   protect(on: :destroy) do
     productions.any?
   end
-
 end
diff --git a/app/views/backend/activities/_season_fields.html.haml b/app/views/backend/activities/_season_fields.html.haml
index d17aaa869d..52e33f82f2 100644
--- a/app/views/backend/activities/_season_fields.html.haml
+++ b/app/views/backend/activities/_season_fields.html.haml
@@ -1,3 +1,3 @@
 .nested-fields
-  = link_to_remove_nested_association(:seasons, f)
+  = link_to_remove_nested_association(:seasons, f) if f.object.destroyable?
   = f.input :name