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Root aphids

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1. Root aphids (Rhopalosiphum rufiabdommalls and tetraneura nigriabdominalis) are recorded for the first time in India, causing severe damage to the rice crop under upland conditions in the entire region (Sbylesha et a/. , 2006).
2. Two species of root aphids VIZ., black root aphids (Rhopalosiphum rufiabdominalis) and brown root aphid (Tetraneura nigriabdominalis) infest the roots of upland rice.
3. The brown root aphid causes more damage than the black aphid. The infestation starts from 48 DAS and the incidence nymphs continue to increase till 83 DAS followed by a decrease at 90 DAS.
4. The aphids feed on roots m colonies around the upper and middle parts of the roots by sucking the sap. The leaves of infested plants become yellowish, wilt and result m stunted growth of plant. The infestation reduces the number of tillers resulting and low yield.

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