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Background: Members of Braconidae, i.e., Meteorus spp. assault certain lepidopterous larvae in Egyptian fields. The recorded species M.rubens (gregarious) and M.gyrator (solitary) were the most species reared from some lepidopterous larvae attacking various host plants in two chosen Governorates in Egypt through two experimental years. This work aims to increase the parasitizing efficiency of M.gyrator in fields by releasing an impressive number of parasitoid adults. Methods: Samples of lepidopteran larvae were picked up from the prevailing plants in fields of El-Ghaebia and El-Sharkia Governorates, for two successive years (2020 to 2021). The prevailing plants are: clover, cabbage, okra, tomato, maize, jew's mallow, bean, soybean, cotton, pea, and lettuce. Collected larvae were reared under optimal conditions until their pupation or in anticipation of the migration of the full-grown endoparasitoid's larvae for pupation. Parasitoid’s production: Species of some lepidopterous larvae were reared in the NRC laboratory for large-scale manufacturing of the parasitoid Meteorus gyrator. Results: Acquired results uncover that Agrotis ipsilon was the primary noctuid host larvae of M. rubens during its abundant periods (February-May). While in case of M.gyrator it was recorded in fewer numbers (at its abundant periods, May-August); which was raised from other lepidopteran larvae. The M. rubens parasitism percentage reached 26.50 and 21.79% at El-Gharbia Governorate through the two experimental years, respectively; whereas in the case of M. gyrator it was 2.25% in the 2nd experimental year only. In El-Sharkia, M. rubens parasitism percentage was 18.60 and 28.60%, respectively throughout the two experimental years; while it was 10.00% for M. gyrator in the first year only. Conclusion: To boost the productivity of this solitary internal parasitoid as a bio-control agent, it is mandatory to increase its adults population in any field.

The preseni ini'estication u'as carried out to study the effrcacv of ceftain mincr,r oirs. neem exlract {-4;utlirachta ittdici,J J"r^r;;;; pirirnicarb irrsecr-icide against nrurphs and adurts oiu "r,o""ptit io strain of ,lpkis craccr,o'a Koch. -foxiciry,rines of'the three minerai oiis (sr-rper-nrisronaR. slrokre.nalr and KzR oilr.l u, r.rcil i,rs ,eem extract and pirirnicarb rvere deterrnilred b1, using thin io1,"r te.nnii,," * p",.i dishes tbr 24 lrour exposurc perit-ids.T]re mi,eral oirs, neenr extract and piri,ricarb *ere evarrratecl usins the [-c1., anci LC5s for each ccmpornJ. ] lr,, ohtained dati show tirat thc high concentrations of neeni cxtract" mineral oils and pirimicarb causcd decrease in rhe acri'ities of chorinest"ru.. filr;. acid phosphates (Acp) and rotiil prc)reins in the nymphs and oO,-,lt, of A. craccit'ora. rhe biorogicai crlbcts of the l.ive'materiais u.cier in'estigatioll \\'erc tcstcd ., cggs and second instar rarvae of the predator (lhrr'.u4terlu c:lrnea Steph. Eggs treaied with Super-rnisr,na and piri'"'rica'h shou'ed. a high p".."ntug" of iratching. fLr.frigfr.r, lai'r'al mofialiry occu;'red in the case,li'thJsec.,-xrci irstar la*,ae treatetl -127--12Eivithpirimicarbatrdthelowestr"asinthosetreatedwithShokronaoils and neem extraci-Key worrls: &cP, ,4pltis truccivorl, Azadirachtu indica' che' Chrysoperla cat'Ytetl. proteins, and toxicitr.