Study on a predacious katydid, Conocephalus sp.
Conocephalus sp. is reported as a new predator of the pyralid rice pest Scirpophaga incertulas in Guangxi, China. The tettigoniid was found to prey on the egg-masses of S. incertulas, S. innotata and the noctuid Prodenia litura [Spodoptera litura] in rice fields; leafhoppers, planthoppers and early-instar nymphs of grasshoppers were also preyed on. The predator had 2 generations a year in Nanning and Guixian. Overwintering occurred as the egg. Eggs were laid singly or in small numbers on the inner surface of the leaf sheaths of Zizania latifolia [Z. caduciflora], ginger and wild gramineous plants; they were also found between the stalks of rice stubble. Overwintered eggs hatched in mid-April. Adults of the 1st generation emerged in mid- to late June, and those of the 2nd generation were found from late-August to the end of the year. Conocephalus sp. was successfully reared on artificial diets; diet-fed adults developed normally. Release of nymphs or adults of the predator for the control of Scirpophaga incertulas is discussed.