i 
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On October 24 larvae of the pink boll worm ( Pectinophora gossypiella 
Saund.) were discovered in. gin trash near Mesa, Ariz. Subsequently other 
specimens were found near the town of Gilbert. Immediately, on the 
confirmation of the identification of these specimens, Maricopa and 
Pinal Counties were placed under quarantine on account of this pest. 
Coincident with this a large number of scouts were placed in this area 
to delimit the infestation. Scouting conducted during the remaining 
part of the year disclosed infestations at some twenty-five different 
places in the eastern end of the Salt River Valley and on the Indian 
Reservation near Sacaton. The infestation at the eastern end of the 
cultivated area was rather severe, :*.n some fields 45 per cent of the 
bolls were infested and in a considerable area 25 per cent of the bolls 
were infested. 
Intensive scouting throughout the Valley as well as the other 
cotton-producing area to the westward, including the Imperial Valley 
of California, failed to disclose the presence of the pest. 
Early iD January the State Horticultural Commissioners of Arizona 
established a non-cotton zone extending two miles beyond the outermost 
points of infestation. They also established a buffer zone extending 
three miles boyond the margin of the non-cotton zone. In the buffer 
zone restrictions are placed on the time which cotton can be planted. 
Climatic conditions in the Salt River Valley are very favorable 
to the development of the pink boll ?/orm and this pest presents an 
immediate menace to the production of cotton in this region. Its 
presence in this Valley also jeopardizes the cotton-producing areas to 
the ^est and the main cotton-producing area to the east. 
(Plant Quarantine and Control Administration, U.S.D.A. ) 
