氟污染对蚕茧生产的影响

EFFECT OF FEEDING SILKWORMS WITH FLUORINE-POLLUTED MULBERRY LEAVES ON COCOON OUTPUT

The maximum and minimum endurance of Chinese silkworm breeds currently reared in Shandong Province to fluorine and the effects of fluorine-polluted mulberry leaves on raising from cocoons and eggs, and on the second generation of silkworms were investigated by feeding the silkworms in different instars with artiflcially or naturally fluorine-polluted leaves. The results as follows: 1. the endurance of silkworms in every instar to fluorine increased 5ppm or so; 2. to the same breed of silkworms, fluorine influence had no season difference; 3. when fluorine in leaves surpassed the critical value of silkworm's endurance, all indices decreased gradually with increasing of content; 4. the influence of feeding with fluorine-polluted leaves on silkworms did not transfer to the next generation; 5. washing leaves with clean water had an obviousiy positive effect on the decrease of absorbing fluorine by the silkworm.