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TABLE 6 indicates the levels of chlorinated h y d r o c a r bon insecticides found in various r i v e r s in the United States. The striking accumulation of endrin and DDT in the Mississippi delta is quite noticeable. However, the levels of all other insecticides in the delta were also high. As compared to levels in the delta, those found in other water s y s t e m s , p a r t i c u l a r l y in California r i v e r s , appear to be low. A B r i t i s h survey also clearly d e m o n s t r a t e s the differences in the pattern of r e s i d u e s resulting from the difference in a g r i c u l t u r a l p r a c t i c e s (Lowden et al.
The consumption of P C P for r i c e w e e d control i n c r e a s e d rapidly. In 1959 only 1 5 , 0 0 0 h e c t a r e s of r i c e w e r e t r e a t e d with P C P , but in 1963, 930, 000 h e c t a r e s ( e . g . , n e a r l y o n e - t h i r d of all r i c e fields) w e r e t r e a t e d . A l s o , in 1959 l a r g e n u m b e r s of fish k i l l s w e r e r e p o r t e d from 34 p r e f e c t u r e s . The damage amounted to 8 9 , 0 0 0 t o n s - - 2 . 6 billion yen in value (Agricultural P r o m o t i o n B u r e a u , 1962).
Ware et al. (1971) demonstrated that levels of DDT derivatives in alfalfa and beef fat immediately declined during the 2-year m o r a t o r i u m period on agricultural use of DDT in Arizona. There are a number of p r e s s i n g p r o b l e m s in the United States that require immediate attention. One is the c u r rent gypsy moth infestation that s t a r t e d from the n o r t h e a s t e r n U . S . in 1970. The infestation has now spread through most of the e a s t e r n f o r e s t s .