Host Plant-Based Artificial Diets Enhance Development, Survival and Fecundity of the Edible Long-Horned Grasshopper Ruspolia differens (Orthoptera: Tettigoniidae)

Author:

Leonard Alfonce123,Egonyu James P1ORCID,Tanga Chrysantus M1ORCID,Kyamanywa Samuel2,Ekesi Sunday1,Khamis Fathiya M1,Subramanian Sevgan1ORCID

Affiliation:

1. Environmental Health Theme, International Centre of Insect Physiology and Ecology, P.O. Box 30772-00100, Nairobi, Kenya

2. Department of Agricultural Production, Makerere University, P.O. Box 7062, Kampala, Uganda

3. Department of Crops, Tanzania Agricultural Research Institute (TARI)-Ukiriguru, P.O. Box.1433, Mwanza, Tanzania

Abstract

Abstract Wild swarms of the long-horned grasshoppers Ruspolia differens (Serville) which are widely harvested for consumption and sale in Africa are seasonal and unsustainable, hence the need for innovative ways of artificially producing the insects. We investigated the development, survival, and reproduction of R. differens in the laboratory on diets mixed with host plants [Digitaria gayana Kunth, Cynodon dactylon (L.) and Megathyrsus maximus Jacq (Poales: Poaceae); Ageratum conyzoides L. (Asterales: Asteraceae)] identified from guts of their wild conspecifics with a view to developing a suitable diet for artificial mass rearing of the edible insect. A standard diet comprising ground black soldier fly, Hermetia illucens L. (Diptera: Startiomyidae) larvae, soybean flour, maize flour, vitamin premix, and ground bones was tested for rearing R. differens as a control against the same ingredients incorporated with individual powders of the different host plants. Whereas R. differens developed more slowly in the diet mixed with D. gayana than in the control diet; its development was faster in the diet mixed with C. dactylon. Mortalities of R. differens in host plant-based diets were 42.5–52.5%, far lower than in the control diet with 71% mortality. The insects raised on the diet mixed with M. maximus laid approximately twice more eggs compared to R. differens fecundities from the rest of the diets. However, inclusion of host plants in the diets had no detectable influence on R. differens adult weight and longevity. These findings support inclusion of specific host plants in artificial diets used for mass rearing of R. differens to enhance its survival, development, and fecundity.

Funder

German Federal Ministry for Economic Cooperation and Development

Deutsche Gesellschaft für Internationale Zusammenarbeit

Fund for International Agricultural Research

BioInnovate Africa Programme

Canadian International Development Research Centre

Australian Centre for International Agricultural Research

Norwegian Agency for Development Cooperation

Foreign, Commonwealth and Development Office

Swedish International Development Cooperation Agency

Swiss Agency for Development and Cooperation

Federal Democratic Republic of Ethiopia

Government of the Republic of Kenya

Publisher

Oxford University Press (OUP)

Subject

Insect Science,General Medicine

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