Volume 53, Issue 6
June 1961, pages 275-324
pp 275-283 June 1961
pp 284-297 June 1961
Development ofCorcyra larvæ on a variety of cereals and millets, pulses, oil-seeds or spices has been studied. Of the various food-stuffs tested, flour of pearl millet and broken grain of wheat proved the best media for the growth of this insect. Results of feeding trials with the various commodities have been discussed in the light of the basal food requirements and the composition of the food offered. The larvæ can flourish in media with a relatively low protein content. On the basis of the results obtained by feeding the larva on fortified media, the factors responsible for a poor development on pulses and other food-stuffs have been outlined. These are the quality of the carbohydrate content and the growth inhibitors. Also the factors which may determine the degree of infestation byCorcyra, i.e., whether this insect can be a major or minor pest of a particular commodity have been enumerated. These factors include physical condition of the food and its chemical composition.
pp 298-301 June 1961
An undescribedXanthomonas species (X. corianderi) inciting leaf-spot and blight of Coriander plant is described. In inoculation studies it was found to infect fennel also (Fœniculum vulgare). The species is closely related to but distinct fromX. carotœ (Kendrick) Dowson.
pp 302-317 June 1961
pp 318-324 June 1961
A root knot disease ofGomphrena globosa has been described. The disease exhibits typical symptoms, hypertrophy, formation of galls and club foot appearance of root system and stunted growth of shoot.
Histopathology of the diseased roots was studied which showed the presence of the nematode in various stages of egg formation and the presence of adult in the extra-stellar region.
The disease was experimentally produced in two varieties ofGomphrena globosa, Lucknow white and Lucknow purple by growing these in nematode-infested soil. Young seedlings quickly die before formation of galls; the more mature plants produce typical galls and finally die.
There is a varietal difference in the reaction of the root tissue of the host to the invading nematode.
The causal nematode has been identified asDiploscapter coronata which is generally regarded as saprophagous.