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THE CONSUMPTION, DIGESTION AND UTILIZATION OF FOOD BY LOCUSTS

A comparative study was made of the consumption, digestion and utilization of cabbage by the 3rd‐, 4th‐ and 5th‐instar hoppers of Schistocerca gregaria and Locusta migratoria. The rate of consumption (C.L.) and the digestibility (except in 3rd instar) of cabbage by Locusta hoppers were greater than by Schistocerca hoppers. However, weight increase, growth rate (except in 4th instar), gross and net efficiency of food utilization were found to be significantly higher in Schistocerca hoppers than in Locusta hoppers. The total live weight gain of Schistocerca hoppers for a period of 18 days was about twice that in Locusta hoppers. Slower growth rate and lesser efficiency of food utilization by Locusta hoppers were considered to be due to nutrient imbalance of cabbage for Locusta.