In Xinjiang, northwestern China, the population of Diuraphis noxia declined in last 20 years. I wondered the temperature increasing declined the population abundance directly. At same time, the state(particularly temperature can increasing in winter) modify the proportion of winter wheat and spring wheat which . This also can influence the aphid population indirectly.

Do you have same condition in your region ? In USA, the damage of this aphid also declined

Any comment is welcomed

Lu