370 



" white spots " were seen on these shrivelled lobes and are probably 

 due to a poison injected when the puncture is made. If the puncture 

 reaches the germ the latter probably ceases to grow. Fungi may 

 appear on these spots, but only in a secondary manner, and it is almost 

 certain that the white spots result from the punctures of the bugs. 



In a further experiment made in October 1919 to test the rapidity 

 of the decrease in germinating power in seeds injured by P. hardwicki 

 it was found after 1^ months that the percentage of heavy (sinking) 

 seeds had greatly decreased, in one case from 53 to 6 per cent. The 

 germinating power also greatly decreased, from 75 to 9 per cent. ; 

 the test conditions were, however, more severe than in nature, where 

 less bugs and more food material would be present. 



Menzel (R.). Over het Optreden van de "Walang Kajoe " in de 

 Thee. [The Occurrence of Cyrtacanthacris melanocornis on Tea.] 

 — De Thee, Buitenzorg, ii, no. 1, March 1921, pp. 12-13, 1 plate. 



The locust, Cyrtacanthacris melanocornis, attacks tea and, more 

 especially, dadap [Erythrina] . It is mainly found at the edges of teak 

 forests and in open places within woods. Its food-plants include coconut, 

 maize, banana, coffee, etc. The trouble is usually of a temporary 

 nature, as the locusts are constantly shifting their feeding grounds. 

 The eggs are laid at the end of the west monsoon, and the young 

 usually appear when the rains set in again in November and December, 

 sometimes later. The infestation is therefore at its height at the end 

 of the rainy season. 



Menzel (R.). Mijten in Theezaad. [Mites in Tea Seed.]— -D^ Thee, 

 Buitenzorg, ii, no. 1, March 1921, pp. 13-15, 1 plate. 



Early in 1921 some of the seeds in parcels from British India were 

 found to be entirely destro3^ed by mites present in large numbers. 

 The external appearance of the seeds was unaltered, but when opened 

 they were found to be full of a reddish-brown dust swarming with 

 cheese mites, Tyroglyphits sp. The mites were only found in seed 

 that floated when tested. They — and probably all other Tyroglyphids 

 — spread by attaching themselves when in the hypopial stage to 

 flies, small rodents, etc. They are preyed upon by a larger Tetranychid 

 mite of the genus Cheyletus. 



Tyroglyphids possess no special breathing organs, thus nullifying 

 fumigation. Heating to 50° C. (122° F.) appears to be the best method 

 of killing them, but this often destroys the infested material. It is 

 very desirable that attention should be given in the packing sheds to 

 these pests in British India ; it is, of course, quite possible that the 

 mites also occur in the Dutch East Indies. 



Mancheron (P.). Malattie degli Agrumi nel Marocco. [Diseases of 

 Citrus Plants in Morocco.] — La Colonisation Jrangaise au Maroc, 

 Casablanca, \, 1920, p. 7. (Abstract in L' Agric. Colon., Florence, 

 XV, no. 5, May 1921, p. 290.) 



Insect enemies of Citrus in Morocco include Aphis aurantii which 

 attacks the young shoots of oranges, especially mandarins, in 

 spring. Ceratitis hispanica oviposits in the fruits ; the only remedy 

 is to collect and destroy the fallen fruits. The most dangerous pests 



