Effect of some biorational insecticides on Spodoptera eridania in organic cabbage.
BACKGROUND
To reduce pest attack, several biorational products are allowed for use on organic vegetables in Brazil. This study investigated eight biorational products applied singly or in combination against Spodoptera eridania Cramer in field plots of cabbage intercropped with coriander. The treatments were applied once a week over a 5 week period, beginning 34 days after transplanting. The evaluations consisted of counting the larvae of S. eridania on the day before and 7 and 21 days after spraying. The damage to leaves and cabbage head, the commercial weight of head and the percentage of head losses were evaluated.


RESULTS
Leaf injury in plots treated with Beauveria bassiana and neem oil (Dalneem) yielded scores of 1.3 and 2.5 (scale ranging from 0 to 4) respectively, in comparison with a score of 3.6 from untreated plots. Head weight losses were 6.1, 5.3 and 4.9% with an aqueous extract of neem leaves, neem oil and B. bassiana respectively, compared with 24.6% lost from untreated plots.


CONCLUSIONS
Dalneem, B. bassiana and the extract of neem leaves at 20% exhibited the best performance for control of S. eridania.
Michereff-Filho
Miguel
M
Embrapa Recursos Genéticos e Biotecnologia, PO Box 02372, Brasília, DF 70770-900, Brazil. micher@cenargen.embrapa.br
Torres
Jorge B
JB
Andrade
Luzia Nt
LN
Nunes
Maria Urbana C
MU
D000818:Animals; D018533:Biomass; D001937:Brassica / Q000737:chemistry / Q000469:parasitology*; D001938:Brazil; D007300:Insect Control; D007306:Insecticides / Q000494:pharmacology*; D007814:Larva / Q000737:chemistry / Q000187:drug effects; D018515:Plant Leaves / Q000737:chemistry / Q000469:parasitology; D018411:Spodoptera / Q000737:chemistry / Q000187:drug effects*
D007306:Insecticides