24 



requires the wheat plant to be in a certain stage of flowering before eggs 

 can be deposited between the glumes. The damage due to Taeniothrips 

 inconsequens (pear thrips) depends on the degree of development of 

 the fruit when the adults appear in the spring, early varieties suffering 

 more severely, the same being true of Contarinia johnsoni (grape 

 blossom midge), which damages the earlier varieties of grape. 



The attacks of Cijdia pomonella (codling moth) are influenced by 

 climate and locahty, the cold backward spring of the Pacific coast 

 delaying the appearance of the adult and reducing the damage due to 

 it. Bryohia pratensis (apple red-spider) is favoured in its development 

 by drought, and those trees are affected most which suffer from lack 

 of moisture. Crops growing near woods and waste lands often suffer 

 severely from specific troubles due to their environment, insects that 

 may be mentioned in this connection being Syneta albkki, Cercopens 

 artemiseae, Mimettis setulosus, various Elaterid beetles, Otiorrhynclms 

 ovatus (strawberry root weevil) and many others. 



The dislike for certain plants exhibited by some species is well 

 known, such as that of Malacosoma erosa (western forest tent cater- 

 pillar) for the pear tree, of the cutworm, Lycophotia margaritosa 

 {Peridroma saucia) for black currants, lettuce, etc., and of Phytometra 

 californica (alfalfa looper) for the maize plant ; in the same way some 

 species of apple are immune to the attacks of Eriosoma Imiigerum 

 (woolly aphis), and some pear stocks to those of Aspidiotus perniciosus 

 (San Jose scale). 



Mackie (D. B.). a Summary of the Work of the Pest Control Section 

 for the Year 19iQ.~Philippine Agric. Review, Manila, 1917, x, 

 no. 2, pp. 128-145. 



The locust situation in the Philippines is more encouraging than 

 at any time since the establishment of the locust office, owing to the 

 amendment of the Locust Act, which provides that all persons between 

 the ages of 16 and 60 inclusive, shall, in time of locust outbreak, render 

 two days a week gratuitous service to the Government in the 

 extermination of locusts. In cases where personal reasons render this 

 obligation inconvenient, it can be redeemed by a payment which 

 thus aoitomatically provides a fund to defray the expenses of the 

 campaign. The extermination of locusts is considered impossible, but 

 thev can be kept below the point of injurious abundance if municipal 

 officials conduct their campaigns vigorously, and, with inspectors 

 available for use in any province, it is often possible to check outbreaks 

 that would otherwise become widespread and serious. 



Investigations are in progress to determine whether the presence of 

 certain insect pests of coconuts determines the prevalence of budrot, 

 and it has been found that Rkynchojihorus pascha, Boh., is a persistent 

 feeder on the decayed part of diseased trees. The chief pests of coconut 

 palms are the rhinoceros beetle [Oryctes] and the weevils Rhynchophorus 

 ferrugineus, Oliv., and R. pascha, the latter being a particularly active 

 and persistent pest, a single larva having been known to gnaw its 

 w-ay from the base to the crown of a tree 14 feet in height. An outbreak 

 of Alem-odicus destructor, Quaint, (whiteflv) was checked by the 

 smip e bi^ drastic treatment of cutting off and burning the infested 

 fronds. For several seasons a Limacodid, Thosea cinereamarginata. 



