The interaction of protectants with EPTC on field bean, and tri‐allate on wheat

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Abstract
SUMMARY: Protectants (antidotes) were tested for their potential to protect field beans (Vicia faba L.) from EPTC damage, or wheat (Triticum aestivum L.) from triallate damage. For both crops there was considerable variation in the degree of protection shown from similar treatments in different experiments. For field bean, a seed treatment of 1,8‐naphthalic anhydride (NA) at 5 mg/g seed gave some protection from EPTC applied pre‐planting at 4–8 kg a.i./ha but not in all experiments. NA also caused marked chlorosis of the foliage. N, N‐diallyl‐2, 2‐dichloroacetamide (R25788) at 20 mg/g seed severely damaged field bean in the absence of herbicide but 5 mg/g gave comparable protection from EPTC to that given by NA and did not cause chlorosis. Mixing R25788 with EPTC in the spray tank gave reduced protection. In a single experiment R4115 (chemistry undisclosed) gave some protection against EPTC damage.For wheat, a seed treatment of 5–20 mg/g NA sometimes countered damage from tri‐allate applied pre‐planting at 1 kg a.i./ha but not generally from higher doses. R25788 sometimes protected from weight loss due to tri‐allate at 1 kg a.i./ha but not from damage symptoms, whereas R4115 at 20 mg/g seed alleviated these symptoms but did not prevent weight loss. R25788 at 4 kg a.i./ha mixed in the spray tank with the herbicide partially reduced weight loss and damage symptoms from a dose of 2 kg a.i./ha. Some treatments of R29148 gave complete protection from tri‐allate at 1 kg a.i./ha.The results are discussed in the context of the full data from the two series of experiments.