Plant Sanitation. 



68 



In the number of this journal for June, 1905, I gaA*e a list of plants 

 affected by the "red borer" ( Zeuzera coffeae). I have now to add to this list 

 two species of Citraceae,— the Orange (Citrus aurantium) and the "China Lime" 

 ( Triphasia trifoUata ). 



The outbreak of the " Arakkoddian worm" (Spodoptera Mauvitia), noted in 

 the December number of this journal, is reported to have abated. 



A somewhat similar invasion of the " Army-worm " (Leucania unipuncta), 

 on cultivated grass in Nuwara Eliya, has been effectively checked by the 

 application of Paris Green. 



The Superintendent of the Government Stock Garden reports that 

 Guizotia Abyssinica (the source of Rantil Oil) proves to be very attractive to 

 bees. Should this plant come into general cultivation — as it gives promise of 

 doing in India— the association of flower and insect should be of benefit to both 

 apiculturists and growers of Guizotia. 



Leaves of various plants have been recommended as available for food 

 of the "Eri" silkworm, in place of those of Castor-oil. 1 find that the half or 

 three-quarters grown worms are fairly complaisant in the matter of change of 

 food ; but for the newly-hatched worms the castor-oil plant remains a necessity. 

 There seems little doubt but that the natural food of the worms is really the 

 best for them. Those raised on other plants are nearly always stunted in 

 growth and produce weak cocoons. If would-be cultivators of silkworms Avould 

 exercise forethought and plant up small plots of ground with castor-oil, there 

 would be no necessity for any change of diet. It is probable that castor-oil 

 can be grown more economically than any other possible food plant. 



The Government Entomologist of Natal asserts (Natal Agricultural Journal, 

 August, 1905, p. 840) that "the malarial species of Anopheles breed, on the whole, in 

 moving water. In no cases have the Anophelinae been found in stagnant water." 

 This may possibly be correct as regards Natal, but it cannot be accepted as a 

 general rule. In the low country of Ceylon the stagnant tanks swarm with 

 Anopheles larvae. I have taken larvae of A. Wilmori plentifully from a tiny 

 pool scarcely three feet in diameter. Mr. Theobald informs me that he has 

 frequently collected the larvae from tubs of rain water in England. The swamps 

 of the Roman Campagna are a notorious breeding place for one of the most deadly 

 species of Anopheles. 



I wish to draw attention to an omission in the description of the figures 

 illustrating my notes in the November number of this journal. The two figures are 

 designed to contrast the work of two different species of Tea mites. The description 

 should read as follows :— 



(a.) Tea leaves attacked by " Scarlet mite." 

 (&.) Do do " Yellow mite." 



Mycological Notes, 



By T. Petch. 



A number of cases of " Brown Blight " have been reported recently. Some 

 of these have been of the type knoAvn as " Marginal Corrosion :5 or " Rim Blight " 

 in which the fungus first attacks the leaf at the tip or along a narrow baud round 

 the edge and later spreads towards the centre. These leaves usually bear the fungi 

 of both Gray and Brown Blight, the latter producing spores in abundance, while 

 the former is often only feebly developed and must be kept for some days in a damp 



