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Chemical Identification
Common Name
Pelargonic acid
中文通用名
壬酸
IUPAC
pelargonic acid
CAS
n-nonanoic acid
Molecular Formula
C9H18O2
Molecular Structure
Category
Activity
As a herbicide, pelargonic acid (Scythe, Grantrico) can only be used on emerged weeds. The product ultimately kills the weeds through rapid water loss; this results from the break down of the waxy cuticle of the plant by pelargonic acid.

It has no residual activity and acts as a contact herbicide, causing darkening of foliage and then wilting. Pelargonic acid is most active against young, succulent, annual weeds with between three and five leaves. It damages all green plant tissue it contacts, but does not damage woody stems and branches. Established weeds and perennial weeds require higher application rates and multiple applications. The product can remove the top growth from bindweed but does not permanently control this weed. Scythe can safely be applied prior to planting of ornamentals, bulbs and corms and can be used to control mosses and suckers on trees and shrubs. Pelargonic acid can be used in mixtures with glyphosate whose activity it synergises.

Thinex is used as a plant growth regulator in apples. It acts on the stigma of non-fertilised blossoms, causing them to wilt. It is safe to fertilised blooms. Thinex is most effective when applied at 65-80% of full bloom after pollination and fertilisation of the king bloom has taken place. Thinex must be used with the adjuvant, Regulaid (Kalo Inc). The activity is greatest at temperatures above 18°C. Thinex does not encourage mite infestations.
CropUse
CropUses:
Scythe: agricultural, non-crop, landscape and ornamental areas and buildings, Thinex: tree fruit, Grantrico: potatoes, peanuts, non-crop

Scythe

32-64 litres ai/ha

Thinex

5.6-11.2 litres ai/ha

Premix

Type

AI concn

Emulsifiable concentrate (EC)

57% (w/v)

?

3% related fatty acids

40% inerts

Toxicology

Acute oral ()

LD50 >5000 mg/kg

Environmental Profile

Bees

Non-toxic

Fate in soil:
Pelargonic acid binds tightly to soil particles.

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