effect of neem [Azadirachta indica A. Juss] thevetia [thevetia peruviana [Pers.] K. Schum.] extracts inhibition of fungi growth causing cotton root-rot disease

The present showed the effect of Neem and Thevetia extract on growth of R. solani. The Stsdy Neem and Thevetia oil seed inhibited the growth of R. solani percentage of inhibition. Data indicated that the inhibition percentage of oil seed for the Neem was 79.3% and for Thevetia it was 75.2%. Ethanolic extract of leaves of Neem and Thevetia showed higher activity on the growth of R. solani at higher concentration. Applying ethanolic extract of the leaves of the Neem and Thevetia, revealed that the inhibition of the extract of leaves on the Neem was markedly higher than of Thevetia [68.9% versus 48.9%]

effect of different concentrations of neem oil extract on some immature stages of culexpipiens l. mosquito

The efficiency control of Neem oil on the eggs and second and fourth instars of Culex pipiens was investigated under laboratory conditions

The concentration of Neem oil [1000 ppm] showed strong effect on hatching percentage [% 46.9] where the hatched larvae were killed after a short period. The lower concentrations [10,100 ppm] showed little efficiency on the eggs, but were effective on the commulative mortality and on mature instars formation

The continuous treatment of the second and fourth instars by Neem oil [100 ppm] caused high mortality, ceasing completely the formation of the mature instars. In general ,the exposure for short period [24,48 hours] was less efficient as compared with the continuous exposure, specifically with low oil concentrations