Influence of phytophagous behaviour on prey consumption by Macrolophus pygmaeus

Omnivorous Heteroptera constitute an important component of predatory guilds with high potential for biological control. Understanding the relative effects of plant feeding on the suppression of prey by omnivores could be an important element for improving biological control strategies. In the current paper, the effects of different plant food sources on the predation rate of the omnivorous predator Macrolophus pygmaeus (Hemiptera: Miridae) were examined. In all the experiments, second instar nymphs of the aphid Myzus persicae (Homoptera: Aphididae) were used as prey at different densities. First, we evaluated the rate at which the predator preyed on M. persicae at various prey densities on pepper and eggplant leaves. Then, using eggplant flowers or pollen as additional food sources, we estimated predator efficiency for three different prey densities. The predation rate was not affected by the type of plant leaf used. However, the results showed that the predation rate of M. pygmaeus was significantly reduced when flowers or pollen were provided at high prey densities. The importance of these results in understanding the influence of phytophagy on predation rates of omnivorous predators is discussed

Use of Plant Resources by an Omnivorous Predator and the Consequences for Effective Predation

Plant-provided food may enhance survival and establishment of omnivorous predators on target crops but on the other hand they may adversely affect predation rates and thus their potential for biological control of target pests. However, it is not known how predation is affected by plant food quality and prey density. The omnivorous predator Macrolophus pygmaeus is commonly used in augmentative releases in greenhouse crops. Experiments have shown its ability to utilize plant resources; eggplant and pepper plant leaves are the most and least suitable, respectively. In this study we searched the effects of floral resources (pollen or flower) of eggplant or pepper plant on the predation rate of M. pygmaeus. We used experiments in dishes (leaves) and cages (plants) under a range of densities of its prey, the aphid Myzuspersicae. We did not find evidence that the consumption rates and the type of the functional responses of M. pygmaeus were affected by the plant leaf (eggplant vs pepper plant) or the increase in the spatial scale (leaf vs plant). However, the presence of pollen or a flower of eggplant and to a lesser extent of pepper plant reduced the plateau of the functional response to aphid density and increased the handling time per prey. The extent of prey feeding replacement by flower resources was dependent on the interaction between plant species and prey density. It seems that there is a constant rate of prey consumption replacement at intermediate and high prey densities on eggplant but only at intermediate prey densities on pepper plant. These results indicate the interactions between plant and prey resources in diets of omnivores and may be useful for its efficacy in pest control on eggplant and pepper plant

Pest control in primary sector: Towards the identification of knowledge gaps

Pest control provides important and useful services in rural and urban environments, activities, and value chains. Despite the significance of them, under operational, environmental and food security and safety terms, there are still gaps in the awareness level of targeted groups. Therefore, in the current work, we have carried out questionnaire-based surveillance to pest control operators in Greece and Cyprus, in an attempt to illustrate their knowledge regarding pest control in conjunction with demographic characteristics. In this context, the results underlined the need for further training in all aspects of pest control, but also relative activities that are often are operated by pest controllers, such as food safety activities and applications in the urban and sub-urban environment. The replies that had been obtained during the survey showed good correlations of knowledge with specific variables, such as the size of the company, the age group, and the educational background, in conjunction with the country in which the professional activities are carried out. To our knowledge, this is the first work of its kind, in terms of pest controllers’ perceptions and selfevaluation, illustrating specific knowledge gaps that have to be alleviated towards improved services in urban pest control, especially in sensitive urban areas and facilities, and improved measures for safety during the applications. © 2021 by the authors

Aedes albopictus (Skuse, 1895) (Diptera: Culicidae) in Greece: 13 years of living with the Asian tiger mosquito

Aedes (Stegomyia) albopictus (Skuse, 1895) (Diptera: Culicidae), commonly known as the Asian tiger mosquito, is an invasive mosquito species of public health significance, well established in many countries worldwide. In Greece, it was first recorded in Corfu and Thesprotia between 2003 and 2004. In the following years, further distribution and establishment of Ae. albopictus in Greece have been confirmed in many Regional Units of the country. In the current study, we report the invasion history of Ae. albopictus in Greece, until 2016. The results from the entomological investigation following imported virus cases in 2014, 2015, and 2016 are also included. Moreover, its presence in Greece is demonstrated in a thematic map based on (a) information provided by pest control companies and/or citizens, (b) the official samples sent to Benaki Phytopathological Institute (BPI) and the National School of Public Health (NSPH), and (c) the entomological surveillance conducted by the BPI