TROCEEDINGS OF THE THIRD ENTOMOLOGICAL MEETING 621 



was checked by Thrips. The growth in the Plains is more rapid than in 

 Darjiling and therefore Thrips do not do so much damage in the Plains. 

 I have found four species which I have sent to Mr. Bagnall. Three of 

 these have been named and the fourth is still unidentified. This un- 

 identified species is the one that got into this checked tea and hindered 

 its growth. The first year the attack was severe. The second year it 

 was mild and the third year it did not affect the tea much. 



The three named species are Plvjsothrips lefroyi, Ph. setiventris (referred 

 to in the Eeport of our 1-iecond Meeting as the "Common Thrips "of 

 tea), and Hcqylotlirips tenuvpennis (referred to as the " Black Thrips " • 

 of tea). 



In Darjihug, rose, Hibiscus and most other flowers are crowded with 

 Thrips. In Jorhat we only get one species of Thrips on flowers of rose. 



Thrips do more damage to plants when the growth is slow and, if the 

 growth quickens, they are thrown off. 



The life-histories of the Common Thrips [Physotlirips setiventris] and 

 of the Black Thrips [HaplotJmps tenuipennis] are dift'erent and so we have 

 to use dift'erent sprays and different methods for each. The pupae of 

 the black Thrips are found amongst lichens covering the stems of the 

 bushes and so, by removing these lichens, you kill the Thrips. The 

 pupae of the common Thrips are found in the soil and are very diflacult 

 to get at, as the methods applied in the case oFthe black Thrips are not 

 suitable. The more you cultivate, the deeper they go. If you cultivate 

 as far down as eighteen inches, they will go further down to pupate. 

 When I suggested different cures to different planters they asked me why 

 I suggested one thing to one man and a different thing to another man, 

 the reason being these differences in habits of distinct species. This 

 proves how essential it is to know the species and its life-history and 

 habits before suggesting remedial measures. 



Dr. Butler's experimental plot of tur suffered very badly from Thrips Mr. Misra. 

 last year. 



We made experiments on onion Thrips by forcible spraying with Mr. Ramrao. 

 water but found that this was of no use. Crude-oil emulsion and fish- 

 oil soap could not kill them at a strength of one pound in four gallons 

 of water, but one-and-a-half pounds of fish-oil resin soap in four gallons 

 of water kept them in check. We had a species of Thrips on cabbage 

 and we sprayed it with this mixture. 



Fish-oil resin soap on edible cabbage ? How could you do it ? What Mr. Ramakrishna 

 About the smell ? • \ Ayyar. 



In Baroda we had Thrips badly attacking lucerne. We tried a water Mr. Patel. 

 Sfiaj but it was no good. We then appUed the followmg measures : — 

 one man was made to disturb the plants and another following him with 



