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Gallmidge Fly (Sarha insects)
Symptoms of Damage:
1. The chief stage of Gall midge which causes damage is the maggot. The maggot feeds on the growing tip and suppresses the leaf primordial differentiation.
2. This in turn induces the development of radial ridges from the innermost leaf primordium followed by an elongation of the leaf sheath.
3. A hallow chamber called the ‘Gall’ forms around the larva. As the larva feeds, the Gall enlarges at the base and elongates having the appearance of an onion leaf or silver shoot
4. There are 3 larval instars. Generally one maggot is found in a tiller.
5. Galls appear within a week after the larvae reach the growing point.
6. In some cases there would be no gall development but necrosis of the growing tip is noticed. Profuse tillering is positively correlated with the silver shoots.
(1) To control Gallmidge Fly grow resistant rice varieties like I.R. 36 and Rajendra Dhan 202.
(2) Dip the root of the seedling before transplanting in solution of Chlorpyriphos 20 E.C. @ 0.02 % + 4 % urea (0.5 lit. Chlorpyriphos in 25 lit. of water) for 3-4 hours.
(3) Where Gallmidge is a serious problem in every year, apply Carbofuron 3G @16 Kg or Forate 10G @ 5Kg or Quinolphos 5G @ 10 Kg per hectare after 15-20 days of transplanting. Repeat the same insecticide after 40 days of transplanting. During application of the insecticide 6-7 cm standing water for 3-4 days in the field is essential.
(4) Spray liquid insecticides like Monocrotofos 36 E.C.@ 1000 ml/ha or Fenthion 100 E.C. @ 500 ml/ha or Fosalon 35 E.C. @ 1500 ml/ha.
(5) Apply 5 % Neem oil to control Gallmidge.