Oklahoma State University

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Foliar Herbicide Residue Injury on Canola Effects of Foliar Applied Imazethapyr - Herbicides - Crop Production - Canola - Plant & Soil Sciences

EFFECTS OF FOLIAR APPLIED Imazethapyr (Pursuit™)
and Imazomox (Beyond™)

 

IMAZETHAPYR AND IMAZAMOX SYMPTOMS: 2% OF A 17G/ACRE RATE

 


Symptoms were not observed at lower rates. Injury symptoms first appeared at flowering time at the 2% rate.

Symptoms included:

1) purpling of side shoot leaves,
2) chlorosis on the newest leaves, main stem and side shoots, and
3) delayed maturity and poor pod fill.

Unsprayed (A) versus sprayed (B) canola, and a close-up of chlorosis on new leaves (C).

Unsprayed plants (A) have normal axis development compared to sprayed (B) plants, which have purpling and chlorosis of side shoot leaves.


Unsprayed plants (A) with normal maturity and pod fill compared to sprayed plants (B).
 

IMAZETHAPYR AND IMAZAMOX SYMPTOMS: 5% OF A 17G/ACRE RATE

 

Symptoms first appeared four days after spraying. Symptoms included chlorosis of new leaves, cessation of leaf growth, crown growth proliferation and a lack of flower production.

Unaffected (A) and affected plants (B) four days after application.

   

IMAZETHAPYR AND IMAZAMOX SYMPTOMS: 10% OF A 17G/ACRE RATE

This close-up shows chlorosis of the 3rd and 4th leaves. These plants did not produce any further growth.

Symptoms first appeared four to five days after spraying and included chlorosis of new leaves, cessation of leaf growth, crown growth proliferation and a lack of flower production. This close-up shows crown growth proliferation.

 

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