Ill 



of the liquid, and the adhesiveness of the poison on the leaf surface. 

 The spray remained effective for many months. Hand-pickiug of 

 caterpillars on young stocks in a nursery is often necessary. A small 

 Pyralid [probably the Tortricid, Argi/roploce leucotreta, Meyr.] is 

 the most serious pest of citrus so far met Avith. but at present 

 seems to be confined to Nairobi and the neighbourhood. Tlie habits 

 and life-history of this moth are given. Attacked fruit, which usually 

 falls prematurely, should be destroyed at once or buried in a deep pit. 

 Constant raking over and cultivation beneath the trees will destroy 

 many pupae. Icenja purcliasi, Msk. (the cottony cushion scale) occurs 

 in one district. A scale closely resembling ChnjmiDphaJns dumntii, 

 Msk., has been found on young imported stock, and Vitisonia sfcUifem, 

 Westvvood, occurs in small numbers. The citrus psylla occurs every- 

 where and, in connection with Aphids, may considerably distort young 

 growing shoots and generally injure the growth of the tree. (lathering 

 the pitted leaves and those carrying the numerous eggs and burning 

 them helps to control this pest. The common Aphid on citrus is 

 Aphis tamresi, Del G. (the black citrus aphis), wliich occurs generally 

 throughout the Protectorate. It is believed that heavy showers of 

 rain help to keep this insect in check. It is very irregular in its occur- 

 rence, appearing suddenly and multii)lying rapidly and then disappear- 

 ing. Only a few parasitised individuals have been found. Toxoptem 

 aurantii, Boy., has also been lecorded from several localities. An 

 unidentified species of small red mite has been found on citrus trees. 

 Powdered sulphur is effective against it, but the maintenance of 

 healthy soil conditions, irrigation if necessary, and the removal 

 of all fruit after the fruiting season is over, are better methods of 

 control. 



The following scale and other insects have been found on coffee : — 

 Coccus (Lecaniutn) viridis africunxs, Xewst., controlled in dull weather 

 with a 10 per cent, kerosene sj)ray and a 5 per cent, spray during bright 

 weather, Saisselia {L.) henu-^pha-ertca, Targ., S. {L.) /ilijra, Niet., 

 Pulvimiria psidii, Msk., and cutworms, of which Euxoa segetuni, 

 Schiff., and Polia inferior, Gn., appear to be the two commonest. 

 Antestia variegala (coffee bug) seems to be on the increase. Hand 

 collecting is the best control method available. Specimens of the 

 cabbage bug, Bagrada picia, have also been found on coffee. The 

 moth, Leucoptera {Cemiodoina) offeclla, is not regarded as serious, 

 but needs to be watched. Tliliploceras octoguttalis, Feld. (the coffee 

 moth) is not a serious pest, but has a wide distribution. Apafe 

 monacha, F., has been recorded in several places, but the true 

 coffee borers,. such as AntJiores huconotiis, have not been found in any 

 of the recognised coffee areas. Cockchafers {Schizongcha, Atiom/ihi. etc. ) 

 have caused damage in some jilantations. The Tenebrionid. Gono- 

 cephalum contractum, has been reported from one plantation. 



Eriosonui lanigerum (the woolly aphis) occurs on apple in some 

 districts. The Coccinellids, Exochoiniis flavipes and Hippodwrda 

 variegala, were found on infested trees apparently feeding on the Aphids. 

 Another Coccinellid, Chilocorus distignta, Kl., feeds on a scale on 

 apples believed to be a species of Diaspis. The Cetoniid beetle, 

 Oxylhgrea elegans, Kl., feeds on the blossom, but is not a serious pest. 

 Orgyia velusta, Hmp., the quince moth, attacks quince trees and 

 is also recorded from apple and black wattle. 



