Agriculture Reference
In-Depth Information
(Tesfaye et al., 2012). Pea aphid density, aphid days, percent plant damage,
biomass weight, and grain yield were significantly different between locations,
seasons, insecticidal treatment levels and crop growth stages. Overall, 42-53%
of unprotected plots and 16-20% of the protected plots showed severe
symptoms of aphid damage. A maximum mean biomass yield loss of 47% and
grain yield of 94% was recorded. Regression analysis of crop damage with pea
aphid days was direct and significant. In contrast, regression analysis of
biomass weight and grain yield with pea aphid density and pea aphid days
showed significant inverse relationship.
Figure 3.Different events during the life cycle of aphids. Source: various occasions and
sources.
