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Insects are a significant source of food for millions of people worldwide. Since ancient times, insects in medicine have been contributing to the treatment of diseases in humans and animals. Compared to conventional animal farming, the production of insects for food and feed generates significantly less greenhouse gas emissions and uses considerably less land. Edible insects provide many ecosystem services, including pollination, environmental health monitoring, and the decomposition of organic waste materials. Some wild edible insects are pests of cash crops. Thus, harvesting and consuming edible insect pests as food and utilizing them for therapeutic purposes could be a significant progress in the biological control of insect pests. Our review discusses the contribution of edible insects to food and nutritional security. It highlights therapeutic uses of insects and recommends ways to ensure a sustainable insect diet. We stress that the design and implementation of guidelines for producing, harvesting, processing, and consuming edible insects must be prioritized to ensure safe and sustainable use.

Agricultural crop productivity relies on the application of chemical pesticides to reduce pest and pathogen damage. However, chemical pesticides also pose a range of ecological, environmental and economic penalties. This includes the development of pesticide resistance by insect pests and pathogens, rendering pesticides less effective. Alternative sustainable crop protection tools should therefore be considered. Semiochemicals are signalling molecules produced by organisms, including plants, microbes, and animals, which cause behavioural or developmental changes in receiving organisms. Manipulating semiochemicals could provide a more sustainable approach to the management of insect pests and pathogens across crops. Here, we review the role of semiochemicals in the interaction between plants, insects and microbes, including examples of how they have been applied to agricultural systems. We highlight future research priorities to be considered for semiochemicals to be credible alternatives to the application of chemical pesticides.

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As significant threats to global citrus production, Diaphorina citri (Kuwayama; Hemiptera: Psyllidae) and Trioza erytreae (Del Guercio; Hemiptera: Triozidae) have caused considerable losses to citrus trees globally. Diaphorina citri vectors “Candidatus Liberibacter asiaticus” and “Ca. L. americanus”, whereas T. erytreae transmits “Ca. L. africanus” and “Ca. L. asiaticus”, the pathogens responsible for citrus greening disease or Huanglongbing (HLB). Though HLB is a destructive disease of citrus wherever it occurs, information on the occurrence and geographical distribution of its vectors in Africa is limited. In recent surveys to determine if HLB vectors are present in Ghana, we observed eggs, nymphs, and adults of insects suspected to be D. citri and T. erytreae. Using morphological traits and DNA analyses, the identity of the suspected insects was confirmed to be D. citri and T. erytreae. Individuals of D. citri and T. erytreae were examined using qPCR for CLaf, CLam, and CLas, but none of them tested positive for any of the Liberibacter species. Herein we report, for the first time, the presence of D. citri and T. erytreae in Ghana (West Africa). We discuss the implications of this new threat to the citrus industry to formulate appropriate management strategies.

Hermetic grain storage (HGS) bags are simple and appropriate to effectively protect stored grains against pests and aflatoxins in areas where effective facilities are lacking. This study assessed farmers’ knowledge and perceptions associated with current practices, awareness-facilitating agents, and HGS bags in interior southern Ghana. The main objective was to provide information that can be included in sensitization and awareness creation programs to increase adoption of HGS bags for sustainable production of grain crops, food security, income-generation, and livelihood improvement across farming communities in selected areas in southern Ghana. Therefore, 925 smallholder farmers were randomly selected and interviewed across three districts (or municipals), which included West Akim Municipal, Ayensuano District, and Suhum Municipal in southern Ghana, using a semi-structured questionnaire for data collection and analysis. The results showed that 95.24% of farmers were still using ineffective grain storage approaches to store grains. Average awareness level about HGS bags among farmers was ≤30%, whereas adoption of HGS bags was very low (4.76%). However, awareness and adoption were mostly observed in West Akim Municipal. Although awareness was significantly dependent on numerous demographic and farming factors, it had significant positive correlations with ‘female farmers’ and respondents’ age-range (36–50 years) only; it suggests that if these two factors are considered in sensitization programs, they will increase awareness about HGS bags. The most performing awareness-facilitating agent was the Ministry of Food and Agriculture, followed by famers’ neighbors. Nonetheless, farmers (who were aware of or adopted HGS bags) were facing challenges or limitations. Hence, the need for training smallholder farmers has been discussed.

As significant threats to global citrus production, Diaphorina citri (Kuwayama; Hemiptera: Liviidae) and Trioza erytreae (Del Guercio; Hemiptera: Triozidae) have caused considerable losses to citrus trees globally. Diaphorina citri vectors “Candidatus Liberibacter asiaticus” and “Ca. L. americanus”, the causative agents implicated in Asian Huanglongbing (HLB), whereas T. erytreae transmits “Ca. L. africanus”, the pathogen responsible for the African form of the disease. Though HLB is the deadliest disease of citrus wherever it occurs, information on the occurrence and geographical distribution of its vectors in Africa is limited. In recent surveys to determine if HLB vectors are present in Ghana, we observed eggs, nymphs, and adults of insects suspected to be D. citri and T. erytreae. Using morphological traits and DNA analyses, the identity of the adult and nymphal stages of the suspected insects was confirmed to be D. citri and T. erytreae, respectively. Individuals of D. citri and T. erytreae were examined using qPCR for CLaf, CLam, and CLas, but none of them tested appositive for any of the Liberibacter species. Herein we report, for the first time, the presence of D. citri and T. erytreae in Ghana (West Africa). We discuss the implications of this new threat to the citrus industry to formulate appropriate management strategies.