G.H. SEWIFY AND A.M. MABROUK
Cairo University , Faculty of Agriculture, Dept. of Economic Entomoloy, and
Dept. of Agricultural Zoology and Nematology , Egypt .

ABSTRACT

Laboratory bioassay of the fungus Verticillium lecanii included different stages of the citrus brown mite, Eutetranychus orientolis under two different temperatures (20 and 27'C). The fungus proved virulent against all stages of the mite. Treatment of the eggs resulted a reduced rate of hatchability. None of the fungal treated eggs hatched at 20'C and only 15% hatchability was obtained at 27'C. Newly hatched larvae from treated eggs failed to develop and died soon after emergence. It was evident that, immature and mature stages were susceptible to fungal infection. Also, newly deposited eggs appeared more susceptible to infection than those about to hatch (7 day old). However, none of larvae, hatched from treated eggs, survived the Treatment. This prelimenaiy results may suggest a promising potential of the fungus as a biocontrol agent against the mite.

Key Words: Entomopathogenic fungi, Verticilliwn lecanii, Tetranychid mite.

BIOLOGICAL STUDIES ON THE MALACOPHAGOUS PREDATOR LIMNOGETON FIEB ER! MAYR (HEMIPTERA: BELOSTOMATIDAE.)

K.T. AWADALLAH, M.F.S. TAWFIK, F. YOUSIF* and K.M. AZZAM*.
Biological Control Laboratory, Faculty of Agriculture, Cairo University , Giza .
* Medical Malacology Department, Theodor Bitharz, Research Institute, Embaba , Egypt .

ABSTRACT

The biology of the malacophagous belostomatid, Limnogeton fieberi Mayr was studied in association with the two snail species Biotnphalaria alexandrina and Hetisoma duryi (at 18-2WC). The durations of the various stages of this predator together with the rate of mortality among immature forms and fecundity were estimated under this feeding condition. It appeared that B. alexandrian, the intermnediate host of Schistosoma inansoni, is more adequate prey than H. duryi and accordingly it could be considered one of the efficient biological control agents of this harmful snail.

Key Words: Biocontrol, Predator, Limnogeton fieberi, Snails.

M.F.S. TAWFIK, K.T. AWADALLAH, F. YOUSIF* AND K.M. AZZAM*.
Biological Control Laboratory, Faculty of Agriculture, Cairo University , Giza , Egypt .
* Medical Malacology Department, Theodor Bilharz Research Institute, Embaba , Egypt .

ABSTRACT

Feeding capacity of the various feeding stages of the belostomatid Limiwgeronfieben upon the two snails, Biomphalarta alexandrina and Ilelisoma duryi was estimated. During the nymphal stage of the predator, this capacity increased progressively in the successive instars, while in the adult stage it appeared higher on II. duryi than on, Balexandrina and in the female than in the male. Observations of the factors affecting rate of consumption upon the last snail showed that this rate increased as temperature increased from 15CC to 30'C. It also increased, but at a decreasing rate with the increase of prey-density. On the other hand, the depth of water did not affect consumption that increased as the size of water decreased.The prey preferability of L. fieberi towards the different snail species living on its natural habitat could be arranged descendingly as follows: Bulinus Iruncatus, Ilelisoma duryi and physa acuta, Biomphalaria alexandrina, Lymnaea cailliaudi, Planorbis planorbis and lastly G. ehrenbergi. The most preferable species was B. truncarus; the intermediate host of Schistosoma haematobium.

Key Words: Predator, Limnogeton fiebeni, Snails, Consumption.

SALWA K. MOHAMMED AND FATHEY H. A. NEGM*
Entomology Dept., Faculty of Science, Am Shams University , Cairo , Egypt
*Plant Protection Institute, Ministry of Agriculture, Giza , Egypt .

ABSTRACT

A list of 2 subfamilies, 5 general and 20 species of family Conopidae occuring in Egypt as well as, keys to all taxa are presented. New taxonomic situations and synonyms according to recent taxonomic status are taxonomically studied.

Key Words: Diptera, Conopidae, Taxanomy , Egypt .

EFFECT OF MELIA AZEDARACH EXTRACT ON EARIAS INSULANA (BOISD.) AND PECTINOPHORA GOSSYPIELLA (SAUNDERS).

AMIRA M. RASHAD, SUZAN H. TAHER, SONIA M. NAGUIB and N.M. ABD EL-SALAM
Plant Protection Research Institute, Dokki, Giza , Egypt .

ABSTRACT

Crude extract of the Meiw azedarach (Meliaceae) leaves was tested at different concentrations against the cotton bolloworms,Eariasinsulana (Boisd.) and Pectinophoragossypiella (Saunders). Obtained results indicated that highest concentrations increased mortality of newly hatched larvae of the two species, prolonged larval and pupal durations and reduced moths emergence too. LC 50 was 0.04623 and 0.53235 for E. insulana and P. gossypiella, respectively. Due to the toxicity and! or antifeeding effect of this extract, such substances could be used as pest control agents in integrated pest control programs but they still require further studies under field conditions.

Key Words: Melia azedaracl, Extract, Boll worms

I.M. KELANY, M.A. EL-DEEB and A.A. EL-FISHAWI
Faculty of Agriculture, Zagazig University , Zagazig , Egypt

ABSTRACT

A pasteform consisted of 150 g wheat bran, 50 g milk powder, 3 g brewer's yeast and 300 ml. water was used as standard rearing medium for the larvea of Musca domesfica. L. The medium was treated with an aqueous neem, Azedirachta indica A. Juss. seed kernel extract (ANSKE); 50 g seed kernel/litre of medium. Third in- star larvae of M. domestica were fed on the treated medium until pupation. Such treatment delayed larval pupation, reduced pupal weight, inhibited adult emergence and caused various malformations for emerged adults.

Key Words: Aqueous Neem, Azadirachta indicq Extraction, House fly.

M.F.S. TAWFIK
Parasites Laboratory, Plant Protection Dept., Faculty of Agriculture, University of Cairo , Egypt .

ABSTRACT

In this investigation, the actual way of dissociation, stnicture in various stages and function of the teratocytes of Apanteles glomeratiss and their fate in the normal host Pieris brassicae L. were described in details. The nutritive role of these elements played towards the parasite larvae is now considered the main function, while their role in protecing them from capsulation appears secondarily and occurs indirectly. They do not represent a special adaptation for the latter role.

SCIENTIFIC NOTE