3, 6-ENDOXOHEXAHYDROPHTHALIC ACID [endothal] 



In research studies the disodium salt of this acid has shown pronnise for 

 control of certain weeds in turf, alfalfa, sugar beets, and in certain other 

 crops. It is being used as a pre-harvest aid, a general contact herbicide, and 

 chemical defoliant. 



Endothal has high oral toxicity (LD^^ 35 to 120 mg./kg.) for rats. 



1, 2-DIHYDROPYRIDAZINE-3, 6-DIONE [MH, maleic hydrazide] 



M.H is formulated as a water-soluble sodium or diethanolamine salt for 

 use as a herbicide. It has shown promise for control of several annual and 

 perennial grasses when applied in combination with tillage and cultural 

 treatments. It is being used also as a grass inhibitor to reduce mowing on 

 areas such as roadsides. Additional research is needed to determine the 

 place of this compound in the field of weed control. 



MH has low oral toxicity (LDjq = 5,800 m.g./kg.) for rats. 



POTASSIUM CYANATE [KOCN] 



This herbicide is a white, water-soluble powder, effective in controlling 

 seedling weeds. It is used as a selective spray for weed control in onions. 



KOCN has relatively low oral toxicity (LD ^ = 780 mg./kg.) for rats. 



CALCIUM CYANAMIDE 



Calcium cyanamide is a water-soluble solid. It usually is formulated as 

 a granulated solid or pulverized pow^der. The byproducts of calcium cyanamide 

 decomposition in acid soils possess both phytotoxic and fertilizing properties. 

 For this reason it is often used as a combination herbicide and crop fertilizer. 

 This chemical has long been used in tobacco plant beds and as a herbicide 

 for weed control and as a fertilizer. 



Calcium cyanamide has relatively low oral toxicity (L.D50 = 1,400 mg./kg.) 

 for rabbits. 



AMMONIUM SULFAlvlATE [aMS] 



This water-soluble, white, crystalline powder is most widely used for 

 control of woody plants in areas adjacent to cotton, grapes, tomatoes, and 

 other plants that are susceptible to the phenoxy compounds. It will prevent 

 stumps from sprouting when applied to the cut surface. It will kill large trees 



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