Herbicide Injuries to Trees-Symptoms and Solutions

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Fig. 2.
Swelling of branch bases (arrows) caused by dicamba uptake from roots in linden.
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Fig. 3.
Interveinal chlorosis in birch from pramitol soil sterilant uptake. Symptoms resemble nutritional deficiencies.
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Fig. 1.
(a) Distorted growth of honeylocust caused by 2,4-D herbicide drift. (b) Distorted growth of honeylocust caused by leafhopper and plant bug. Symptoms of the two are easily confused.

Table 1. Herbicide residues in woody plant vegetation.

Chemical name	No. tests	Avg. amt. in tissues (ppm)	Lowest residue producing symptoms
2,4-D	13	0.52	0.018
dicamba	9	0.092	0.03
prometon	10	5.25	2.10
atrazine	5	2.64	0.14
bromacil	11	1.70	0.14
tebuthiuron	13	11.15	1.00
picloram	3	0.094	0.02