الفهرس 
Effect of bacteria on Lepidopterous insectsOnly 14 pages are availabe for public view
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Abstract
Cabbage (Brassicae oleracea var. capitata L.) and cauliflower (Brassicae oleracea var.
botrytis L.) plants are considere the most economic important crucifer plants. They are attacked
by many insect pests at their growth stages which cause decrease in the crop under Egyptian
conditions such as Artogia rapae L., Plutella xylostella Gurtis., Tetranychus urtica L., Bemisia
tabaci Genn. and Thrips tabaci lind., Brevicoryne brassicae L. and Monacha cartusiana. The
present study was conducted during 2005 & 2006 for winter growing seasons of both host plants
and during 2006 & 2007 for summer growing seasons of cabbage plants at Wardan, Giza
Governorate to study the activity of the pests infesting these two crops and their relation to the
abiotic factors ( Mean temperature & mean relative humidity in addition, their associated
predators, parasitoids and pathogens. Results could be summarized as follow:
1. Survey of insect pests infesting crucifer plants (cabbage and cauliflower), and
associated natural enemies in Giza Governorate
- Twenty-six species belonging to twenty-six genera and twenty-four families of 11 orders were
recorded as follow
- Eleven pest species belonging to eleven genera and eleven families and six orders (eight insect
pest species belonging to eight genera and eight families of four orders; two mite pest species
belonging to two genera and two families of one order, one snail pest species).
- Nine predators belonging to nine genera and seven families of six orders (eight insect predator
species belonging to eight genera and six families of five orders; one mite predator species).
- Six insect parasitoid species belonging to six genera and six families and one order.
2. Seasonal abundance of certain insect pests infesting cabbage and
cauliflower plants
The total number / 40 leaves of white butterfly, aphid, whitefly, thrips, diamondback moth
and animal pests infesting cabbage and cauliflower, were recorded.
2.1. Artogia rapae immature stages
In winter 2005 on cauliflower, three peaks were detected. The first two peaks, 22nd of
September and 3rd of November had 25 and 51 individuals / 40 leaves, respectively, while the
third peak on 24 th of November had the highest activity (68 individuals / 40 leaves). In 2006,
also three peaks was observed, 19 th of September, 24 th of October and November 28th. The
recorded numbers of insects were 43, 33 and 62 individuals / 40 leaves, respectively.
This insect proved to be more active at the end of September and during November in
both winter seasons. In winter 2005 on cabbage, three peaks in the population abundance were
found on 15th of September, 13th October and 24th of November. (22, 17 and 75 individuals / 40.