Insect Management
Rice Insect Management
Aphids
Greenbug - Schizaphis graminum (Rondani) and bird cherry-oat aphid,
Rhopalosiphum padi (L.) - Occasional Pests - Crossover Pest From Other
Crops From Wheat and Weeds to Rice
Life Cycle as Related to Wheat, Weeds, and Rice
Aphid
infestations normally do not begin in rice, rather aphids may be numerous in
wheat or adjacent weeds and move into rice. 1996 was the first year greenbugs
were reported in rice. Some were found in the years since, but the number of
fields infested and the densities in fields has decreased. Bird cherry-oat
aphids were first reported in rice in 1997, and have been reported each year
since.
Treatment Levels
Rice plants with 1 to 2 leaves have been observed to be killed when 2 or 3
greenbugs fed on the plants. Larger plants can be damaged but more greenbugs are
required to cause severe damage or death. Aphids and greenbugs should be treated
when the rice stand is threatened and substantial numbers of aphids are present.
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