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regulation may be effected by special Executive decree, also determin- 
ing at the same time -the procedure to "be adopted for prevention and 
control, in which case the respective declaration will be subject to 
conditions prescribed in each instance by these regulations. 
Art. 62. ~ Plants and plant products intended for food, in- 
dustrial, or medicinal purposes or for ornamentation are subject to 
the restrictions established by the Secretaria de Agricultura only 
when it is established or believed that they are vehicles of pests 
or diseases harmful to agriculture. 
Arts. 63 to 73» ~ Miscellaneous provisions. 
Chapter VIII, arts. ~jk to S5. - Penalties. 
AUTHORIZED MEXICAN POUTS OF ENTRY 
On the northern frontier: Mexicali, Baja California; Nogales, 
Sonora; Ciudad Juarez, Chihuahua; Piedras Negras, Coahuila; Nuevo 
Laredo and Matamoros, Tarnaulipas, On the Gulf coast: Tampico, 
Tamaulipas; Veracruz and Puerto Mexico, Veracruz; Frontera, Tabasco; 
Progreso, Yucatan.- On the Pacific coast: .Guaymas and Yavaros, 
Sonora; Topolobampo and Mazatlaii, Sinaloa; Manzanillo , Colima; 
Acapulco, Guerrero; Salina Cruz, Oaxaca; Tapachula, Chiapas. Other 
ports of entry may be authorized on special request and on payment 
of the cost of employing an inspector. 
SPECIAL QUARANTINES 
EXTERIOR QUARANTINE NO. 1 - CITRUS TRESS 
(Decree of Dec. 2, 1922) 
This is a partial quarantine on account of citrus canker 
( Bacte r iun citri Hasse) ; citrus root worms ( Ty lenchus semipene trans 
Cobb); the citrus blackfly (Al eu ro can thus woglumi Ashby) ; and other 
pests and diseases new to or not widely distributed in Mexico. 
