diff --git a/include/core/wildmoninfo.h b/include/core/wildmoninfo.h
index 8845bef2..f9011c9c 100644
--- a/include/core/wildmoninfo.h
+++ b/include/core/wildmoninfo.h
@@ -4,9 +4,9 @@
 #include <QtWidgets>
 
 struct WildPokemon {
-    int minLevel;
-    int maxLevel;
-    QString species;
+    int minLevel = 5;
+    int maxLevel = 5;
+    QString species = "SPECIES_NONE";
 };
 
 struct WildMonInfo {
diff --git a/include/editor.h b/include/editor.h
index 3cc09fbf..7e1ec0ee 100644
--- a/include/editor.h
+++ b/include/editor.h
@@ -146,6 +146,7 @@ private:
     void updateMirroredConnectionDirection(MapConnection*, QString);
     void updateMirroredConnectionMap(MapConnection*, QString);
     void updateMirroredConnection(MapConnection*, QString, QString, bool isDelete = false);
+    void updateEncounterFields(Fields newFields);
     Event* createNewObjectEvent();
     Event* createNewWarpEvent();
     Event* createNewHealLocationEvent();
diff --git a/src/core/wildmoninfo.cpp b/src/core/wildmoninfo.cpp
index b0142a5d..1769dc93 100644
--- a/src/core/wildmoninfo.cpp
+++ b/src/core/wildmoninfo.cpp
@@ -10,7 +10,7 @@ WildMonInfo getDefaultMonInfo(Field field) {
     newInfo.encounterRate = 0;
 
     for (int row : field.second)
-        newInfo.wildPokemon.append({5, 5, "SPECIES_NONE"});
+        newInfo.wildPokemon.append(WildPokemon());
 
     return newInfo;
 }
diff --git a/src/editor.cpp b/src/editor.cpp
index a002b69c..86edb18d 100644
--- a/src/editor.cpp
+++ b/src/editor.cpp
@@ -419,6 +419,14 @@ void Editor::configureEncounterJSON(QWidget *window) {
             fieldChoices->setCurrentIndex(fieldChoices->count() - 1);
         }
     });
+    QPushButton *deleteFieldButton = new QPushButton("Delete Field");
+    connect(deleteFieldButton, &QPushButton::clicked, [drawSlotWidgets, fieldChoices, &tempFields]() {
+        if (tempFields.size() < 2) return;// don't delete last
+        int index = fieldChoices->currentIndex();
+        fieldChoices->removeItem(index);
+        tempFields.remove(index);
+        drawSlotWidgets(index);
+    });
 
     QPushButton *addSlotButton = new QPushButton(QIcon(":/icons/add.ico"), "");
     addSlotButton->setFlat(true);
@@ -440,6 +448,7 @@ void Editor::configureEncounterJSON(QWidget *window) {
     QHBoxLayout firstRowLayout;
     firstRowLayout.addWidget(fieldChoiceLabel);
     firstRowLayout.addWidget(fieldChoices);
+    firstRowLayout.addWidget(deleteFieldButton);
     firstRowLayout.addWidget(addFieldButton);
     firstRowLayout.addWidget(removeSlotButton);
     firstRowLayout.addWidget(addSlotButton);
@@ -460,14 +469,10 @@ void Editor::configureEncounterJSON(QWidget *window) {
     layout.addWidget(frameBottom);
 
     if (dialog.exec() == QDialog::Accepted) {
-        // Copy the temporary modified field info to project.
-        Fields &newFields = project->wildMonFields;
-        newFields = tempFields;
+        updateEncounterFields(tempFields);
 
         // Re-draw the tab accordingly.
         displayWildMonTables();
-
-        // TODO: Update values for every single wild encounter entry?
     }
 }
 
@@ -497,6 +502,50 @@ void Editor::saveEncounterTabData() {
     }
 }
 
+// Update encounters for every map based on the new encounter JSON field data.
+void Editor::updateEncounterFields(Fields newFields) {
+    Fields oldFields = project->wildMonFields;
+    // Go through fields and determine whether we need to update a field.
+    // If the field is new, do nothing.
+    // If the field is deleted, remove from all maps.
+    // If the field is changed, change all maps accordingly.
+    for (Field oldField : oldFields) {
+        QString oldFieldName = oldField.first;
+        bool fieldDeleted = true;
+        for (Field newField : newFields) {
+            QString newFieldName = newField.first;
+            if (oldFieldName == newFieldName) {
+                fieldDeleted = false;
+                if (oldField.second.size() != newField.second.size()) {
+                    for (QString map : project->wildMonData.keys()) {
+                        for (QString groupName : project->wildMonData.value(map).keys()) {
+                            WildPokemonHeader &monHeader = project->wildMonData[map][groupName];
+                            for (QString fieldName : monHeader.wildMons.keys()) {
+                                if (fieldName == oldFieldName) {
+                                    monHeader.wildMons[fieldName].wildPokemon.resize(newField.second.size());
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+        if (fieldDeleted) {
+            for (QString map : project->wildMonData.keys()) {
+                for (QString groupName : project->wildMonData.value(map).keys()) {
+                    WildPokemonHeader &monHeader = project->wildMonData[map][groupName];
+                    for (QString fieldName : monHeader.wildMons.keys()) {
+                        if (fieldName == oldFieldName) {
+                            monHeader.wildMons.remove(fieldName);
+                        }
+                    }
+                }
+            }
+        }
+    }
+    project->wildMonFields = newFields;
+}
+
 void Editor::setDiveEmergeControls() {
     ui->comboBox_DiveMap->blockSignals(true);
     ui->comboBox_EmergeMap->blockSignals(true);
diff --git a/src/project.cpp b/src/project.cpp
index ebb5cfeb..cc12f15f 100644
--- a/src/project.cpp
+++ b/src/project.cpp
@@ -1418,11 +1418,11 @@ void Project::readWildMonData() {
                     header.wildMons[field].active = true;
                     header.wildMons[field].encounterRate = encounter.toObject().value(field).toObject().value("encounter_rate").toInt();
                     for (QJsonValue mon : encounter.toObject().value(field).toObject().value("mons").toArray()) {
-                        header.wildMons[field].wildPokemon.append({
-                            mon.toObject().value("min_level").toInt(),
-                            mon.toObject().value("max_level").toInt(),
-                            mon.toObject().value("species").toString()
-                        });
+                        WildPokemon newMon;
+                        newMon.minLevel = mon.toObject().value("min_level").toInt();
+                        newMon.maxLevel = mon.toObject().value("max_level").toInt();
+                        newMon.species = mon.toObject().value("species").toString();
+                        header.wildMons[field].wildPokemon.append(newMon);
                     }
                 }
             }