摘要:

Summary1The influence of nitrogenous food in the hive is discussed in its bearing on the question of swarming.2Theories of the origin of the brood food are examined.3The division of labour among the bees of various ages is considered in its relation to the brood rearing cycle.4A critical surplus of nurse bees is found to be associated with the formation of queen cells in preparation for swarming.5Eecognised swarm control measures are reviewed in the light of the brood food theory.

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1930.tb07340.x

出版商:Blackwell Publishing Ltd    

年代:1930

数据来源: WILEY

摘要:

Summary1In several previous papers on Thysanoptera it has been shown that the condition or type of soil may have some influence on the infestation of a plant by thrips.2Experiments were carried out to determine the effect of different types of soil on the infestation of the cotton plant by Thrips tabaci.3The types of soil used in the experiments were a heavy clay soil and a light soil with less than 15 per cent, of clay, about fifty pots being filled with each type.4Each block of fifty plants was divided into two and the soil in one half was tilled while in the other it was left undisturbed.5It was found that the plants in the block with unfilled clay soil were least infested by T. tabaci, while the plants in the block with light, tilled soil were the most highly infested.6The average infestation of the two blocks with light soil was slightly higher than the average infestation of the clay soil blocks, in spite of the fact that at the beginning of the season the former blocks of plants and the thrips on them suffered severely from a sudden great rise in temperature.7In both types of soil the block with tilled soil was more highly infested than the other block.8It appears from these experiments that light soil is more favourable to the multiplication of soil pupating species of thrips than an easily eaking, clay soil and that tilling the soil increases the infestation by these insects.

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1930.tb07341.x

出版商:Blackwell Publishing Ltd    

年代:1930

数据来源: WILEY

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1930.tb07342.x

出版商:Blackwell Publishing Ltd    

年代:1930

数据来源: WILEY

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1930.tb07343.x

出版商:Blackwell Publishing Ltd    

年代:1930

数据来源: WILEY