Embrapa and CABI open registrations for seminar on pest resistance

The event will take place on May 5th, at Embrapa Soja, in Londrina (PR); registration is free

19.04.2023 | 14:08 (UTC -3)
Lebna Landgraf

Embrapa Soja and CAB Internacional (CABI) promote the seminar Pest Resistance: An old current problem, on May 5th, at Embrapa Soja, in Londrina (PR). Registration is free, with limited places, and can be done via link. 

According to the head of Research and Development at Embrapa Soja, Adeney de Freitas Bueno, the event should bring together approximately 180 professionals to discuss the issue of insect resistance to insecticides and Bts plants (which contain the toxin Bacillus thuringiensis – Bt, which assists in the control of the main species of caterpillars). Embrapa has studies showing that bed bug populations (mainly Euschistus heros) are reported to be resistant to different chemical groups of insecticides and the caterpillar Rachiplusia nu and the armpit borer (Crocidosema aporema) already show resistance to the Cry1Ac protein, present in first generation Bt soybeans. “These cases of resistance make field management difficult and can, if not managed properly, lead to greater use of insecticides”, explains Bueno.

The indiscriminate use of pesticides to control insects, as well as the non-adoption of refuge areas for the cultivation of Bts plants, have favored the selection of resistant pest populations each year. Among the anti-resistance strategies to insecticides are the alternation of insecticides with different modes of action, the use of doses recommended by research, the use of cultivars that are more tolerant to pests, refuge, among others. Refuge is the cultivation of a percentage of the area (in the same plot) with the same non-Bt crop. “The objective is to maintain the population of insects susceptible to the Bt toxin so that they can mate with potentially resistant individuals – coming from areas with Bt plants – thus delaying the selection of insects resistant to the technology”, explains Bueno.


In recent years, information on the level of action (insect density or injury in which insecticide application is recommended) has been updated, without compromising soybean productivity. This information is the basis of Integrated Pest Management (IPM) recommendations to avoid unnecessary insecticide applications. "We have observed that the problem of control failures for some pests has been getting worse. This is due to the frequent use of products with the same mode of action without respecting the recommended action levels, which represent the appropriate time to apply insecticides”, reports Bueno.

Given this scenario, the event program will feature a debate on four main themes: pest resistance to insecticides, pest resistance to Bt soybeans, pest management recommendations in refuge areas and choice of soybean cultivars for maximum refuge productivity . “During the event, we will present the soybean cultivars that can offer maximum productivity to producers who adopt the refuge and how the refuge should be managed to guarantee its profitability associated with its resistance management objective”, highlights Bueno.CABI - A CAB International (Commonwealth Agricultural Bureaux) is a non-profit intergovernmental development and information organization that focuses on disseminating science for agricultural and environmental issues.   


Seminar - Pest Resistance: An old current problem

Order date: 05/05

Open Hours: 8:30 pm - 11:30 pm

Location: Embrapa Soja Auditorium – rod Carlos João Strass s/n – Londrina (PR)

Free registration: https://www.embrapa.br/soja/seminario-resistance

LS Tractor February