A water soluble granule containing Plant Growth Regulator maleic hydrazide, for the control of sprouting in potatoes and onions.

Improves the marketable quality of the crop.

Proven efficacy over many years of use.

Industry and supply chain recognition of brand as sprout suppressant.

Highly effective control of difficult volunteer potato.


Product use: Plant Growth Regular.

Composition: 600 g/Kg maleic hydrazide

Formulation: Water soluble granule

Registration number: MAPP 13617

Mode of action: Foliar applied treatment in potato for volunteer control and post-harvest sprout suppression. Pre-harvest growth suppressant on bulb onions for sprout suppressant.

Shelf life: 2 years

Storage conditions: Temperature from -10C to +35, keep in original container, tightly closed, in a safe place

More information: ukenquiries@arysta.com

Registered Use

User: Professional

Crops/situations: Maximum individual dose: (kg product / ha) Maximum total dose: Maximum number of treatments: (per crop) Latest time of application:
Potato 5 - 1 21 Days before harvest
Bulb onion 4 - 1 7 days before harvest
Directions of Use


Steadily pour the required quantity of Fazor in to a three-quarter filled spray tank with continuous agitation, then add the remaining water whilst maintaining agitation. Continue agitation for a further 5 minutes or until the product is fully dispersed in the spray tank. Continue agitation during spraying. Ensure that all spraying equipment is thoroughly washed out immediately after use.


Best results are achieved when Fazor is applied on its own.


ONIONS: Sprout inhibition


Do not spray onions earlier than two weeks before maturity or spongy bulbs may result. Green tops are essential for the absorption of Fazor and its translocation to the bulb. A minimum of 4 days must elapse between treatment and topping. Use only on varieties with good keeping qualities. Premature application may increase the incidence of browning of the growing point if dormancy breaks in store.

Rate of Use

3.5 to 4.0 kg in 500 to 600 litres water per hectare. The high rate of Fazor may give better sprout control and must be used for long term storage.


Apply at 10-30% necking and not later than 50% necking, when tops are still green. This stage usually occurs about 10 days to 2 weeks before harvest. Do not apply less than one week before harvest.



Do not use on seed or first early potatoes, or potatoes intended for use as seed.

Occasional injury to the terminal growth has been observed following the application of Fazor. Varieties with vigorous haulms and late maturing foliage, e.g. Cara, may be particularly prone to such damage. Growers should regularly inspect treated tubers in store. Treatment with a secondary sprout suppressant may be required at the first signs of sprouting. Uneven or excessive application (such as overlapping spray swaths) may result in reduced efficacy and physiological disorders such as rose end* cracking and/or thick skins on potatoes. * i.e. the end where most eyes occur.

General Information

Fazor should be used on second early and maincrop varieties not being used for seed as part of an integrated programme for the control of volunteer potatoes in succeeding crops. Fazor will also suppress sprouting in all potato varieties in store. The length of control achieved in a given season will be a function of several factors including variety, growing conditions, application conditions and accuracy, length of storage period and conditions during storage period.

Rate of Use

5.0 kg in 350 to 500 litres water per hectare.


Application should be made to the actively growing foliage when the smallest tubers required to reach marketable size will be not less than 25 mm long and starting to expand. Typically this will be 3 to 5 weeks before haulm destruction but may occur earlier. The most important factors are the number of tubers required to reach marketable size and the health of the haulm. Do not desiccate or haulm destruct within 3 weeks of applying Fazor. For optimum results, the crop condition should be as follows:


The last few flowers may still be apparent but most of the blossom will already have fallen.


Haulm health and tuber size are the two most important factors to bear in mind when applying Fazor. A few of the lowest leaves may be turning yellow but the haulm must be predominantly green and actively growing, and free from stress, disease and insect attack.


Sample plants should be dug at random to examine tuber size and number before deciding to spray. Tubers less than 25 mm long will stop growing after application, so only the tubers which are larger than this at application will be harvested.


Application five weeks before haulm destruction has been shown to give better sprout control than the later timing of three weeks before haulm destruction.