Em 2010 o conteúdo de glucosinolatos em diferentes plantas brássicas foi determinado para estudar a influência sobre a alimentação de percevejos de repolho (Eurydema spp.) e a extensão do dano causado. Através do método do cultivo armadilha, durante o período de crescimento foram amostradas as partes aéreas de óleo de colza, mostarda branca, nabo forrageiro e dois híbridos de repolho branco. O conteúdo de glucosinolatos depende das espécies de plantas, órgãos de plantas e período da amostragem. Predominaram nas amostras os glucosinolatos alifáticos (glucoiberina, progoitrina, epiprogoitrina, sinigrina, gluconapina, glucoraphenina, sinalbina). A glucobrassicina foi detectada em todas as brássicas testadas. Sua concentração no nabo forrageiro foi mais alta na primeira avaliação (30 DAS), 8.84 ± 0.65 µmol g-1 ds, enquanto houve a menor concentração no óleo de colza durante a última avaliação (134 DAS), 4.30 ± 0.80 µmol g-1 ds. Considerando o experimento de dois anos, conclui-se que o óleo de colza foi o mais adequado como cultivo armadilha para atrair o percevejo do repolho. Glucosinolatos podem ser usados no futuro mais extensivamente em várias modalidades de produção de alimentos, entre as quais o emprego de cultivo armadilha para diminuir os danos do percevejo do repolho.

In 2010, we were determining the contents of glucosinolates in different Brassicas in order to study their influence on feeding of cabbage stink bugs (Eurydema spp.) and the consequent extent of damage. We confirmed that glucosinolates content depends on plant species, plant organs and the time of sampling. In the samples aliphatic glucosinolates (glucoiberin, progoitrin, epiprogoitrin, epiprogoitrin, sinigrin, gluconapin, glucoraphenin, sinalbin) prevailed. Glucobrassicin, an important indolic glucosinolate compound, was detected in all tested Brassicas. Its concentration in the oil radish samples was highest during the first assessment (30 DAS), 8.84 ± 0.65 µmol g-1ds, while the oilseed rape samples displayed lowest concentration during the last assessment (134 DAS), 4.30 ± 0.80 µmol g-1 ds. The stimulative activity of individual glucosinolates or their negative influence on feeding of cabbage stink bugs in the Brassicas used in our experiment was not uniformly manifested. Based on a two-year field experiment we concluded that oil rape was the most adequate trap crop used to allure cabbage stink bugs. In future, glucosinolates should be employed to a greater extent in environmentally acceptable ways of food production, one of which is also the use of trap crops in order to reduce harmful effects of cabbage stink bugs.

To increase our knowledge on the susceptibility of entomopathogenic nematodes (EPN) species to agrochemicals, the compatibility of the infective juveniles (IJ) of the entomopathogenic nematodes Steinernema feltiae, S. carpocapsae, and Heterorhabditis downesi with 15 chemical fungicides was investigated under laboratory conditions. The effect of direct IJ exposure to fungicides for 24 h was tested in a petri dish at 15, 20, and 25 °C. The results showed that the compatibility of S. feltiae with azoxystrobin was high, and similar findings were obtained for S. carpocapsae (strain C67) and all of the tested fungicides, except for tebuconazole + spiroxamine + triadimenol, maneb, dinocap, and copper (II) hydroxide + metalaxil-M. Nematode H. downesi (strain 3173) suffered the highest mortality rate when infective juveniles were mixed with tebuconazole + spiroxamine + triadimenol. The integration of the aforementioned agents into a pest management program is also discussed.

Para aumentar nuestro conocimiento sobre la susceptibilidad de especies de nematodos entomopatogénicos (EPN), se estudió la compatibilidad de los juveniles infectivos (IJ) de los EPN Steinernema feltiae, S. carpocapsae, y Heterorhabditis downesi con 15 fungicidas químicos bajo condiciones de laboratorio. El efecto de exposición directa de IJ a fungicidas por 24 h se evaluó en una placa Petri a 15, 20 y 25 °C. Los resultados mostraron que la compatibilidad de S. feltiae con azoxystrobin fue alta, y hallazgos similares se obtuvieron para S. carpocapsae (cepa C67) y todos los fungicidas probados, excepto para tebuconazole + spiroxamina + triadimenol, maneb, dinocap, y cobre (II) hidróxido + metalaxil-M. El nematodo H. downesi (cepa 3173) presentó la mayor tasa de mortalidad cuando los IJ fueron tratados con tebuconazole + spiroxamina + triadimenol. También se discute la integración de los agentes antes mencionados en un programa de manejo integral de plagas.