78 



6 



Zebra Caterpillar (Mamestra picta, Harris). 



(d) Leaves eaten by caterpillars with black and yellow stripes — Zebra 

 Caterpillar (Mamestra picta). 



(e) Leaves wilt and turn yellow, and presence of greenish lice — Turnip Plant 

 Louse. 



(f) Young leaves eaten into holes and irregular blotches by small active 

 green caterpillars— Diamond Back Moth (Plutella crucif erarum) . 



(g) Under-surf ace of leaves covered with a very fine loose web ; leaves yellowish 

 in patches, and minute red objects present — Red Spiders. 



(h) Leaves minutely specked by small spots; hopping insects present — Leaf 

 Hoppers. 



INSECTS INJURIOUS TO THE POTATO CROP. 

 The Tubers — 



(a) Surface of tuber eaten and eyes sometimes destroyed so that growth 

 does not take place; or holes bored in the tuber — White Grubs, Wireworms, 

 Millipedes. 



The Stalks and Leaves — 



(a) Stalks cut off at the ground — Cutworms. 



