Time of infection determines how much yield loss is likely to occur on susceptible hybrids. If plants are infected before reaching 45 days of age, losses are greater than if infection occurs later. Control Four methods of control can be used in the management of aphid infestations on sorghums. These management methods usually perform best when used in combination, but they may also be used separately. Time of planting.
Sorghums are warm weather crops.
These temperatures allow more rapid seed germination, seedling growth and root system establishment without the adversities associated with cool to cold weather. Soil temperatures in Missouri usually reach this 60 degree F level during the last half of May or early June. Planting at this time does not reduce the maximum yield potential and may even increase yields. This suggested planting time corresponds with small grain ripening and peak migration of winged greenbugs from small grains to other hosts. Theoretically, the majority of greenbugs will have moved to other hosts by the time seedlings emerge.