Skip to content.

Some features of this website require Javascript to be enabled for best usibility. Please enable Javascript to run.

Ministry of Agriculture, Food and Rural Affairs

sprout inhibitor injury

Maleic hydrazide, a sprout inhibitor, is applied to onion crops heading to storage. If it's applied to immature crops it can result in spongy bulbs. The proper use of maleic hydrazide inhibits sprouting and lengthens the storage life of many onion cultivars. The optimum time for spraying is when 50% of the tops have fallen, but tops are still green. This usually occurs 8–14 days before harvest. Plants with less than three green leaves and/or severely diseased foliage will not absorb maleic hydrazide