Marigold (Tagetes erecta) in the control of insects infesting pechay
1997
Sagun, D.C.
The insecticidal property of Marigold (Tagetes erecta) was tested against insects infesting pechay using varying crude leaf extract concentrations which were: 10 percent (100 gms of leaves in one liter of water; 15 percent 9150 gms of leaves in one liter of water); 20 percent (200 gms of leaves in one liter of water) and marigold as intercrop with pechay compared to a control. The test was further done to evaluate insect infestation and to compare the effectivity of T. erecta when sprayed and when intercropped. Likewise, the cost of preparation and application of Marigold leaf extract was compared to the cost of treatment using synthetic insecticides. This study was conducted at an 84 sq. m. vegetable garden at Ramon, Isabela [Philippines] from February to March 1997 using the Randomized Complete Block Design (RCBD). The incidence of insect infestation was recorded at one week interval. Treatment 1, the control had the highest recorded infestation. Treatment 2, 3, 4, and 5 were effective in controlling insects infesting pechay especially flies. The difference between the treatments were significant at P = 0.05 during the first and second week of observation on slightly damage leaves. The insecticidal property of T. erecta could be accounted most likely for the pungent, sulfur like scent emitted by the whole plant. The economic analysis shows that using Marigold as intercrop with pechay is more economical than using synthetic insecticide in controlling insect infestation in pechay
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