(is ANNUAL REPORTS OP DEPARTMEN1 OP AGRICUI/TUBBj 1961 
and other pests of the [slanda More than 131,000 boxes and i 
containers were certified after such treatment inspectors in Hawaii 
inspected 12,400 pieces of baggage, some in automobile trunks, and 
sealed them prior to departure to the mainland by ship. They also 
examined 527,000 packages of cut flowers and leis destined for 
tinental United States. After inspection and treatment with a DDT 
aerosol B,250 planes leaving Hawaii for the mainland were granted 
preflight clearance. This clearance followed the removal of unau- 
thorized plant material from the passenger or ba§ ompartments 
of more t han t wo-t birds of I be pla i 
Plant quarantine activities in Puerto Rico showed an increase simi- 
lar to that in Hawaii. Twenty-two thousand boxes and other con- 
tainers of fruits and vegetables moved under certification from 1 } 
Rico to the mainland. Large numbers of agricultural workers flown 
to the mainland in a "labor airlift" brought about a Large inci 
in the preflight in-pert ion of aircraft in Puerto Rico. Nearly 
planes were cleared prior to departure. This involved the examina- 
tion of 292,000 pieces of passenger's baggage, nearly half of which 
would have carried unauthorized plant material to the continental 
United State- had it not been intercepted. 
Sa feguarding vehicular and rail t ramc from Mexico assumed added 
importance because of the growing threat of the entry of the citrus 
blackfly and other pests from that country. During the year L0,328,- 
300 vehicles were inspected at border port- of entry. This represents 
an increase of nearly 23 percent over L950, which had also been a 
ord year for such t ramc. Enspect ion was maintained around the clock 
at strategic port- connected with the interior of Mexico by paved 
highways. The need for vigilance on this front was evidenced by the 
frequent interception of such pests as the citrus blackfly, the .Mexican 
and other fruit Hie-, the pink bollworm, an Iri-h potato weevil, and 
avocado weevils. 
Range riders of the Bureau of Animal Industry, patrolling the 
Mi \ ican border to prevent the entry of animals or products likely to 
carry foot and-nioiith disease, apprehended some alien- with contra- 
hand plant material. Of special importance was an interception of 
citrus leaves infested with citrus blackfly from an alien who had 
reached the citrus belt of the Liower Rio Grande Valley. 
A total of 76,000 freight ear- were examined in Mexico prior to 
crossing the holder, an increase of L0 percent over L950, and 3,421 
pullman and passenger coaches were inspected at the border. It was 
-;iry to fumigate only 359 freight ear- as a condition of entry, 
as a result of the recent modification of fumigation requirements to 
take advantage of changed pest condition- m Mexico resulting from 
the Bureau's cooperative work in that country. The Bureau's coop- 
erative program with Mexico to prevent the spread of pests from 
the mainland to P>aja California, was effective in protecting both 
the west coast of Mexico and California and other sections of the 
United States. Experience acquired during the brief period this 
project has been in operation has permitted the strengthenim 
the westward spread in Mexico of the pink boll- 
worm, Mexican fruit fly, citrus blackfly, holl weevil, and other major 
