Entomologists have often used computational modeling to study the dynamics of insects in agricultural landscapes. Recently, important issues such as the movement of adults and immatures associated with insect resistance to GMO (genetically modified organism) crops have been addressed using computational models. We developed an individual-based model using the cellular automata approach (CA) to investigate how an intercropping system composed of maize engineered with Bacillus thuringiensis (Bt) gene, refuge areas (non-Bt maize), and grasses combined with off-season periods might influence the evolution of resistance in Spodoptera frugiperda (Lepidoptera: Noctuidae), one of the leading agricultural pests targeted by GMOs.

We designed the Bt and non-Bt plants in two different arrangements: (a) a seed mixture and (b) strips rows, adding grasses in areas adjacent to the field. We added the seasonal planting dynamics (crop season and off-season), to evaluate a total of six agricultural scenarios. We followed a crop calendar from the United States to create simulations close to agricultural practice.

The results showed that the frequency of the resistance allele was strongly related to the landscape arrangements and their dynamics. Since the adult insects are mobile, the seed-mixture scenario increased the frequency of the resistance the most (95.86%), followed by strips (82.10%), without grass fields. The maize harvest made it possible to reduce the frequency of resistance allele below 1%. Based on our results, we can expect that the maintenance of pasture areas, for instance next to the corn crops, will act as a reservoir of susceptible insects during off-season periods.

A Lasting Vision is dedicated to the Mirror of Literature (Kāvyādarśa), a Sanskrit treatise on poetics composed by Dandin in south India (ca. 700 CE) and to its remarkable career throughout large parts of Asia. The Mirror was adapted and translated into several languages in the southern Indian peninsula (Kannada, Tamil) and the island of Sri Lanka (Sinhala, Pali), as well as in the Tibetan plateau far to the north (Tibetan, Mongolian). In all these receiving cultures, it became a classical text and a source of constant engagement and innovation, often well into the modern era. It also traveled to Burma and Thailand, where it held a place of honor in Buddhist monastic education and intellectual life, and likely to the islands of Java and Bali, where it contributed to the production of literature in Old Javanese. There is even reason to believe that it reached China and impacted Chinese literary culture, although far more peripherally than in other parts of Asia. It also maintained a prominent position in the Sanskrit learned discourses throughout the Indian subcontinent for at least a millennium. This multi-authored volume, organized by region and language, is the first attempt to chart and explain the Mirror’s amazing transregional and multilingual success: what was so unique about this work that might explain its near-continental conquest, how it was transmitted to and received in the many different environments, and what happened to it whenever it was being adopted and adapted.