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Simazine (Princep) injury
Eric Hanson, Horticulture
Simazine is one of the safest preemengent herbicides, but excessive rates can cause injury. Symptoms are similar to those of iron chlorosis. Symptoms appear irregularly in the bush and include yellowing between the leaf veins and eventually browning and death starting along leaf edges.
Bushes with mild to moderate symptoms survive but grow poorly for several years.
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Last Updated - 6/22/07