Field investigations on the efficacy of NeemAzal-T/S against Dysaphis plantaginea (Passerini) (Homoptera: Aphididae) and its effects on larvae of Chrysoperla carnea Stephens (Neuroptera: Chrysopidae).
In 1995 field investigations were carried out at Dossenheim, Germany, on the effectiveness of NeemAzal-T/S at 0.3% against Dysaphis plantaginea on apple and on its side-effects on Chrysoperla carnea. A single application of NeemAzal-T/S in April gave very good control of D. plantaginea for about 5-6 weeks. After this period D. plantaginea built up new colonies and Aphis pomi, too, increased in abundance. Yield losses caused by D. plantaginea were significantly lower in the neem-treated plot than in the untreated control plot. The side-effect test revealed, that in the field NeemAzal-T/S is harmless to larvae of C. carnea. The test was based on evaluation of the survival of the larvae, their further development and pupation and the fecundity and fertility of the resulting adults.