414 



mOCEEDINGS OF THE TIIIKD ENTOMOLOGICAL MEETING 



actually found being as many as 72. These young caterpillars spread 

 after a short time and go into other plants ; but by that time the grains 

 are formed and developed so that although many plants are bored they 

 are observed to have sound ears. Three 2| yards x 2J yards plots 

 were selected at random at Bhoraha which showed a bad attack, just 

 before harvest, and the results of the examination are given in Table 

 XIV. The plants in columns 6 and 7 of this Table must have been 

 attacked before the crop came into ear and many of them were young 

 undeveloped shoots the tillers 'of which developed and bore ears. As 

 will appear from this Table, no correct idea can be formed of the actual 

 damage by the borers from an examination of the stubbles. 



The presence of a large number of hibernating larvae, at least of some 

 species, in the stubbles of a field does not seem to affect the crop in the 

 next year. In September 1917 large numbers of Rice Chilo caterpillars 

 were obtained in the sweepers' plot within the Estate. In 1918 there 

 was hardly any Rice CMIo in this plot. 



Damage to Juar {Andropogon sorghum) by Borers. 



In the young state juar is very liable to be affected by Muscid flies 

 and throughout its grown-up state by the other borers mentioned under 

 it. Chilo simplex and Diatrwa venosata are however, the most injurious. 

 Both these borers hibernate in large numbers in juar stalks, individual 

 stalks harbouring as many as twenty or even more hibernating larvas. 



Twenty-five varieties of juar were grown in small plots (one-fortieth 

 of an acre) in the permanent experimental area of the Pusa Farm in 1918. 

 The result of examination of them in the first week of November is 

 given in Table XV. 



Table XV. — The varieties of Juar mi sinall plots were side by side in the 

 Punjab experimental area excepting No. 25, Dura, which ivas at 

 some distance. 



