Certified Crop Advisor Practice Exam

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If a non-target crop has an albino appearance, it may have been sprayed with which type of herbicide?

Glyphosate
HPPD/pigment inhibitor
Chloracne
2,4-D

The correct answer is: HPPD/pigment inhibitor

The correct choice is related to the effects of HPPD (4-Hydroxyphenylpyruvate Dioxygenase) inhibitors, which are a group of herbicides known to cause chlorosis or an albino appearance in plants. This herbicide works by inhibiting the biosynthesis of carotenoids, which are essential pigments in plants. When a non-target crop is inadvertently exposed to an HPPD inhibitor, it may lose its natural green coloration and exhibit signs of bleaching or an albino appearance due to the lack of these pigments. In contrast, glyphosate, while it can damage non-target crops, typically causes a yellowing or wilting effect rather than a bleaching appearance. Chloracne is not a herbicide but rather a skin condition associated with certain chemical exposures, and 2,4-D, a synthetic auxin, generally leads to broad leaf distortions and necrosis rather than an albino effect. Thus, the unique action of HPPD inhibitors makes them the most likely cause of the albino appearance observed in the non-target crop.