177 



Tree- planting operations have been conducted in four different 

 localities on forest reserves, the greatest attention being paid to 

 reforestation on watersheds adjacent to settlements in order to 

 conserve the water supply. A total of 20,000 trees of various 

 species were thus planted out and cared for during the calendar 

 year 1918 and one-half of these consisted of the native koa. A 

 new mountain nursery was started in the Waianae Mountains on 

 Oahu, with others to follow. 



A section of high mountain country at Kokee, on the Island 

 of Kauai, was opened up to summer campers under a permit 

 system. A total of 48 camp sites were surveyed out on meadow 

 land along mountain streams, and half of these have already been 

 taken up under ten-year permits. 



ENTOMOLOGY. 



The work of the entomological division, performed by a grad- 

 uate entomologist and two laboratory assistants, has consisted of 

 introducing, propagating and distributing beneficial insects, ad- 

 vising in regard to agricultural and stock pests, and investigating 

 various projects for improving the control of insects detrimental 

 to agriculture and stock-raising. 



The beneficial insects propagated and distributed have been the 

 Mediterranean fruit-fly parasites, the melon-fly parasite, the corn 

 leaf-hopper Qgg parasite, mealy-bug parasites, etc. A great im- 

 provement has been noticed in the fruits attacked by the fruit-fly 

 and the melon-fly, and the corn leaf-hopper tgg parasite has been 

 used as a means of checking incipient leaf-hopper attacks. New 

 field work has not been undertaken on account of unsettled con- 

 ditions abroad and poor transportation facilities, but in the latter 

 part of the year the cooperation of the California State Commis- 

 sion of Horticulture was secured and, through the assistance of 

 their entomologist, a hymenopterous parasite of the pupa or 

 chrysalid of the cabbage butterfly, the worm of which is very 

 destructive to cabbage plants, has been introduced and its natural- 

 ization attempted. Both the parasite and its host were originally 

 European insects. An exhibit of economic entomology and dem- 

 onstration of natural control of insect pests was made at the 

 Territorial fair in June, which attracted considerable attention 

 and proved of great educational value. 



The investigational work of the entomologist has consisted of 

 a study of the termites or white ants, the natural control of scale 

 insects with a view to its improvement, the control of the biting 

 flies which attack live-stock, etc. Some time has also been given 

 to the study of several groups of endemic insects as a contribu- 

 tion to scientific entomological knowledge. 



PLANT INSPECTION. 



The work performed by the Chief Plant Inspector and his as- 

 sistants during the fiscal year consisted of the following: 



