Citizenship and Immigration Canada has imposed new visa rules on Citizens of Mexico and the Czech Republic. Starting on July 14, 2009, Mexican and Czech Republic Citizens will require a visa to travel and enter Canada. The Canadian Government is allowing for a 48 hour grace period for Mexicans and Czechs to apply for the visa on entry to Canada, however, effective Wednesday at midnight, a Canadian visa will be required before entry.

As of Wednesday at midnight, Czech Republic and Mexican citizens must apply for a Temporary Resident Visa (TRV) before arrival in Canada and meet the requirements to receive one.
The reason for the decision on the part of the government of Canada is to stop the rapid increase in refugee claimants from these two countries many of whom start refugee claims that are ultimately unsuccessful.
The effective of this is that these citizens must before travel to Canada apply for a Canadian TRV at a Canadian Visa office abroad which will have to be done well in advance of any travel to Canada. The applicants must establish that they qualify for a TRV by establishing that there visit to Canada is temporary, the will not overstay their approved time in Canada, they have not funds to cover their stay in Canada amongst other requirements.
The Czech Republic is likely to now impose similar visa requirements on Canadians traveling to the Czech Republic and it is uncertain whether Mexico will do the same.