110 



the cotton plant except the roots, forming blisters which are lined with. 

 a thick growth of very fine hairs, among which the mites live. 



The West Indian native cottons may be divided into two groups, 

 those irannme to this mite and those which may be attacked by it, 

 but which are fairly resistant as compared with the very susceptible 

 sea-island cotton. In general it may be said that the nearer an in- 

 digenous cotton approaches that variety in morphological characters, 

 the more susceptible it becomes. 



With regard to budded cottons the only scion which remained 

 immune was one that was budded on to the susceptible sea-island stock, 

 AVhen a susceptible scion was budded on to immune stock, the resis- 

 tance was apparently increased, but when the stock was fairly resistant 

 and the scion susceptible, or vice versa, the susceptibility or resistance 

 of the scion remained unchanged. 



In the case of hybrids the F/1 of the cross " immune " by " sus- 

 ceptible " is almost immune when sea-island is the susceptible parent, 

 but when upland cotton is used as the susceptible parent, the F/1 is 

 also susceptible. The F/1 of the cross " susceptible " by " susceptible " 

 is susceptible; as is also the case when " susceptible " is crossed with 

 " fairly resistant." 



Anderson (T. J.). Report on the Entomological Laboratory for 

 the Year ending 31st March 1914. — Ann. Rept. Dept. Agric. 

 British East Africa, 1913-1914, Nairobi, 1915, pp. 52-83. 

 [Received 27th December 1916.] 



The coconut beetle {Oryctes monoceros, 01.) is the worst enemy of 

 coconut palms on the coast of British East Africa. Experiments were 

 made in its control by means of traps consisting of heaps of decaying 

 vegetable matter to which the beetles are attracted for egg-laying. 

 A hole was dug in the ground about 9 feet square and about 18 inches 

 deep, and filled with parts of stems of palms and other vegetable 

 matter. For filling the traps numbers of dead palms were split up 

 and the various stages of the beetle they contained collected, counted 

 and destroyed. A detailed record of the first 1,000 palms cut shows 

 that both standing and fallen dead palms are breeding grounds for the 

 beetles, and therefore their destruction is essential. A list of the 

 beetles, etc., found in 186 of the traps 4|- to 5 months after construction 

 is also appended. No more traps will be constructed at present, but 

 those already made will be examined regularly to find out if they become 

 more effective with age, and if so, whether other breeding places are 

 thus eliminated. All traps are being made under riovernment super- 

 vision or on the plantations owned by Europeans, as even the better 

 class native cannot be trusted to carry out the work satisfactorily 

 imle.ss supervised. A species of Aspidiotus was reported to be doing 

 considerable damage to young palms near Mombasa. A resin and 

 washing soda spray was suggested against it and gave satisfactory 

 results. 



Papilio deniodocus, Esp. (the citrus butterfly) occurs wherever citrus 

 fruits are grown in the Protectorate, but nowhere in very large numbers. 

 The caterpillar is parasitised to some extent by an Ichneumon and was 

 controlled by a spray of arsenate of lead to which a small quantity of 

 soft soap and gelatine was added. This increased the wetting power 



