Major insect pests of rice on hilly tracts of Uttar Pradesh, India.
Some 40 insects species were found during systemic surveys of rice-fields carried out at Hawalbagh (1250 m above sea level) and other areas in Uttar Pradesh, India. The main pest was Sesamia inferens (Wlk.), which was active from early July to late September; 50-60% of the plants were infested by mid-September. Cnaphalocrocis medinalis (Gn.) was present in greatest numbers in the second half of August. Damage was caused at all growth stages, including in the nursery, by several species of grasshoppers, such as Oxya fuscovittata (Marschall) and Trigonidium cicindeloides Ramb. Other important pests were Sogatella furcifera (Horv.), Dolycoris indicus Stal, Nezara sp. and Leptocorisa acuta (Thnb.). Several species of white grubs, including Anomala dimidiata var. barbata Burm., Popillia cupricollis Hope and Holotrichia seticollis Moser were found in dryland rice. Heteronychus lioderes Redt. caused considerable damage to the nursery stge of irrigated rice in medium altitude areas; larvae and adults fed on the roots.