. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 2 BULLETIlSr 1374, U. S. DEPAETMENT OF AGEICULTUEE inches. Cotton production is possible only by irrigation, and owing to lack of reservoirs the irrigation water which comes from the Nazas River must be put on the land whenever the water is available. As the greater part of the irrigation water usually arrives in the fall and winter, the general practice is to flood the fields (fig. 2) to a depth of from 1 to 3 feet at that time of the year. This often rep- resents all the water that the following year's crop receives
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 2 BULLETIlSr 1374, U. S. DEPAETMENT OF AGEICULTUEE inches. Cotton production is possible only by irrigation, and owing to lack of reservoirs the irrigation water which comes from the Nazas River must be put on the land whenever the water is available. As the greater part of the irrigation water usually arrives in the fall and winter, the general practice is to flood the fields (fig. 2) to a depth of from 1 to 3 feet at that time of the year. This often rep- resents all the water that the following year's crop receives except for what little rain may fall during the growing season. The work of 1921 and 1922 supplemented that of 1918 and 1919. As the life history and the habits of the pink bollworm under Laguna conditions were rather thoroughly studied in the previous research work, the greater amount of attention during the last two years was devoted to studies aimed more directly at \^^^^^^^^&Limi^'£:IM^&LtMMS^Sm^nfi^^i Fig. 1.—Typical Laguna district scenery, showing character of country surrounding the valley DISTRIBUTION OF THE PINK BOLLWORM Since the report on the 1918 and 1919 work was published, new and important records of the occurrence of the pink bollworm in various parts of the world have been made. The species is .'now known to occur in India, Palestine, Mesopotamia, Ceylon, Burma, Siam, Straits Settlements, China, Japan, Korea, the Philippine and Hawaiian Islands, East Africa, Zanzibar, Egypt, Sudan, West Africa (southern Nigeria, Angola, Sierra Leone), Italian Somaliland, Brazil, West Indies, and Mexico, and in Texas, New Mexico, and Louisiana in the United States. The occurrence of the insect in the West Indies is of special interest. It was first reported from Montserrat and St. Kitts in November, 1920. Later it was reported from Anguilla, St. Croix, and Porto Rico. In July, 1921, it was reported to occur throughout the Lee- ward and British Virgin Island
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