32 SCIENTIFIC REPORTS OF THE AGRICULTURAL RESEARCH 



Air and light retard Calandra oryzce and if one can take 

 the trouble of exposing the grain to air and light at fre- 

 quent intervals very little damage is done. But this is not 

 practicable when large quantities have to be stored. 



In the light of this experience wheat has been stored 

 this year under a method of outdoor storage in granaries 

 made entirely of straw. In this condition the grain will 

 remain exposed to the natural changes of climate and is not 

 expected to be susceptible to attack by Rhizopertha. It 

 remains to be seen whether Calandra oryzce also is retarded. 

 If successful, this method will be applicable to storage in 

 bulk as well as in small quantities. At the same time 

 arrangements have been made to give a satisfactory trial 

 to the method of storage under sand. 



(ii) Rice. The lime treatment of husked rice has been 

 continued and it is giving the satisfactory result reported 

 last year. 



(Hi) Pulses. Pulse seeds have to be protected in store 

 against Bruchus chinensis which has been observed to breed 

 in the larger varieties of peas (Pisum sativum), arhar 

 (Cajanus indicus), lentil, khesari (Lathyrus sativus), mung 

 (Phaseolus radiatus and P. mungo), bora (Vigna catjaug), 

 bakla (Vicia faba) and gram, and cause serious damage to 

 them. Keeping the seeds covered with sand, coarse or fine, 

 has given the best result, the seeds remaining in good condi- 

 tion and perfectly safe. 



A species of Bruchus has been found to damage bean 

 seeds in store in the same way as the above. The same 

 method of storing under sand is applicable. 



The small pea (Pisum arvense), as reported previously, 

 is not liable to be damaged by Bruchus chinensis in store. 

 But it is infested by Bruchus affinis in the field. This was 

 dealt with in the last year's report. A system of sunning 

 the harvested seeds has been tried this year and the result 

 remains to be seen. 



(iv) Besides the insects mertioned above, of the others 

 which are found in stored wheat and rice, (1) Tribolium 

 castaneum and (2) Tenebroides mauritanicus are very com- 



