Toxicological Studies

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II - Toxicological Studies:-

A-Field evaluation of tested treatments on Lepidosaphes pallidula infests mango trees:

1-Field evaluation of tested treatments on different stages of Lepidosaphes pallidula.

Data presented in table (XXI) and graphs illustrated in Fig (94) showed the mean percentage reduction of different stages of Lepidosaphes pallidula and the average of total population.

Four post treatment counts were recorded, (two, four, six and eight weeks) after spraying mango trees with the tested insecticidal agent in May 2009 at Shebeen al Qanater area.

a- the first post treatment count after 2 weeks from spraying:

The obtained results of percentage reduction of different stages of L. pallidula after two weeks from application presented in table (XXI ) and histogramatically illustrated in fig (94 ) showed significant difference between stage response to tested treatments where "F" value was being 24.77 and L.S.D.= 8.34 at (5% level). However the preadult stage recorded the highly affected one against the tested treatments followed by the adult female stage then, the oviposting (gravid) females. The percentage reduction were (73.32, 60.58 and 47.35%) respectively. On the other hand there was insignificant difference between the nymphal and the adult stage. Also there was insignificant difference between adult s and gravid stage.

b- The second post treatment count after 4 weeks from spraying

Statistical analysis of data presented in the same table and figure after 4 weeks from application clearly showed an insignificant difference between the efficiency of tested treatments used on the different stages of studied pest where "F" value being 29.21 and L.S.D. value was 7.67 at (5% level). There was an ins...

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The data presented in table(XXI) and figure (95) showed a significant difference between the tested treatment on Lepidosaphes pollidula total population where "F" value was 11.27 and L.S.D value equal 3.01 (at 5 % level) .The average percentage reduction was highly superior in case of Biofar ( 85.7 % ) and Bioranza ( 85.4 % ) with insignificant difference between these two treatments. On the other hand, there were insignificant difference between the first two treatments and the summer oil Super Mox oil (81.3%) and highly significant difference between the first two treatments (Biofar & Bioranza) and the winter mayonnaise oil (Mox oil).

Table (XXI): Percentage reduction in Lepidosaphes pallidula different stags and the mean total population treated with some insecticidal agents on mango trees at Qaliobiya Governorate at spring 2009.

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