TheWoWDBIf you can't find this immediately after installing it you need to "reset" your farm's phase. Just move far enough away that you phase out of your farm (the inn at Halfhill is far enough), then go back and your Pest Repellers should be right in the middle of your plots.
Quest
"Thunder King" Pest Repellers
A World of Warcraft quest in Valley of the Four Winds. Facts and objectives from the current retail game data.
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You can buy this and use it after completing Growing the Farm II: The Broken Wagon, which is available once you reach revered with the Tillers.
Handing in this quest to Farmer Yoon automatically installs a new pest repeller system to your farm. By clicking the device you can deal with each "Infested" type crops at once.
Quest facts
LevelLevel 15-35
Quest ID31937
The client quest POI data records no map location for this quest, so no map is shown.
Check whether you have already completed this quest
in-game: /run print(C_QuestLog.IsQuestFlaggedCompleted(31937))
Description
<An imposing image of a mogu face dominates this box, casting its gaze downward at neatly ordered rows of bold text.> "DO NOT LET WEAK, DISGUSTING INSECTS INFEST YOUR GLORIOUS CROPS. CONQUER THEM WITH THE MIGHT OF THE THUNDER KING AND PROTECT YOUR LEGACY." <The rest of the space is dedicated to cartoon depictions of various insects crying out in lament or fleeing in terror.>
Community notes from Wowhead · 17 comments
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Reward details
Reputation: The Tillers +250
The Tillers are peaceful and productive pandaren, working with the land to feed the massive appetites of their people.
Reputation group: Mists of Pandaria.
Other quests in Valley of the Four Winds that reward The Tillers reputation: A Helping Hand (+900), Learn and Grow II: Tilling and Planting (+500), Learn and Grow III: Tending Crops (+500), Learn and Grow IV: Harvesting (+700), Learn and Grow V: Halfhill Market (+999), Mung-Mung's Vote I: A Hozen's Problem (+400).
Item facts are the current retail client’s (ItemSparse); the specialisations for a pick-one item are the ones the Blizzard quest API lists; faction and currency text is the client’s own. Lowest listed price = the US commodity auction house now.