Abstract The negative impact of pests on world agriculture is estimated at 1.4 trillion dollars, which 5% the global gross domestic product. In order to save crops lost due agricultural in world, it urgent importance develop effective and fundamentally based control measures against them. this research, main studied were Aphis craccovora Koch; gossypii Glow; Brevicoryne brassicae, Lysiphlebus f...

Leaf colour has been proposed to signal levels of host defence to insect herbivores, but we lack data on herbivory, leaf colour and levels of defence for wild host populations necessary to test this hypothesis. Such a test requires measurements of leaf spectra as they would be sensed by herbivore visual systems, as well as simultaneous measurements of chemical defences and herbivore responses t...

O controle de insetos fitófagos como o pulgão da couve Brevicoryne brassicae (Linnaeus, 1758) (Insecta: Hemiptera: Aphididae) geralmente é realizado com inseticidas químicos, que pode causar danos ao ambiente e à saúde humana, bem selecionar resistentes a pesticidas. Dessa forma estabelece-se necessidade pesquisar desenvolver métodos alternativos para couve. Nesse sentido, utilização extratos v...

The population dynamics of major brassica pests and occurrence of their natural enemies were monitored weekly for a period of 9 months on cabbage (var. Copenhagen Market) at a research station plot (no pesticides applied) and a farmer’s field (weekly application of Permethrin 10 EC or Dimethoate 40 EC) in Central Kenya. Pest infestations occurred within 14 days after the seedlings were transpla...