Deformation of appendages, antennal segments and sensilla of aphid (Aphis craccivoraKoch) treated withTagetes minutaoil: a scanning electron microscopy study

The effect ofTagetes minutaoil on the morphology ofAphis craccivorais reported in the scanning electron microscopy (SEM). Results showed that, flagellar segments of antenna treated withT. minutashowed filamentous and knotted without losing the setae after 96 h of treatment. The sensilla (Type I and II) showed remarkable deformation, reduction in the length and width. Morphometric measurements also helped to identify the deformed sensilla on cuticle and antenna. Type I and antennal sensilla reduced its length by 30% and type II sensilla by 42%. The breadth of type I and II sensilla also reduced by 35%.