373 



the only method is to burn over the field in the autumn. Various 

 plants, including currants, gooseberries, etc., are injured by the Capsid, 

 Poecilocapsus lineatus, F., the four-lined leaf bug. The eggs are laid 

 in the stems in the autumn, hatching out in May or June. The larvae 

 attack the young terminal leaves, sucking the sap and causing brown 

 spots. Spraying with " Black Leaf 40 " is the best remedy. Oxi/jitilus 

 'periscelidactylus, the grape plume moth, cannot be regarded as injurious, 

 since growth does not seem to be checked by the larvae. In large 

 vineyards no remedial measures are adopted. The Colorado potato 

 beetle {Leptinotarsa decemlincata) has been successfully controlled 

 by the use of either lead arsenate or zinc arsenite, both of which kill 

 the larvae and do not injure the foUage. The Jassid, Gyponaflavilineata, 

 has been observed on the Japanese barberry ; spraying ^^•ith nicotine 

 solution seemed to have little effect. The green apple aphid, Aphis 

 pomi, can be successfully controlled by spraying or dipping into a 

 solution of Black Leaf 40, at the rate of 1 teaspoonful in 1 gal. water. 

 The only record of the harlecpiin bug, Murganiia histrionica, in Connecti- 

 cut is a specimen found at Meriden in 1910. Rhyacionia (Evetria) huoli- 

 ana, the European pine-shoot moth, has recently been introduced from 

 Europe ; the larvae feed on the growing buds . Control measures cannot 

 as yet be recommended. Oak, maple and apple have been attacked by 

 Elaphidion villosum (oak twig-pruner) . The larva of this species 

 forms tunnels in the wood under the bark towards the base of a branch. 

 The latter breaks off in strong mnds and falls to the groimd carrymg 

 the larva with it. Pupation takes place in the burrow ; the adult 

 emerges in the folloA\'ing spring. The only control measure is to burn 

 the fallen t\\dgs. The pear psylla {Psylla pyri) is easily killed by the 

 use of " Black Leaf 40," one-half pint in 50 gals, water. The stems 

 of herbaceous plants are often attacked by the larva of Papaipema 

 nehris (nitela), which tunnels in the pith, finally causing death. Lygidea 

 mendax, the false red bug, has caused considerable damage to apple 

 trees by sucking the sap from fruit and foliage. Thorough spraying 

 with nicotine solution in combination with lead arsenate, lime-sulphur 

 or Bordeaux mixture, gives satisfactory results. A similar spray can 

 be used against Scolylus quadnspinosns, the hickory bark-borer ; the 

 solution should be applied in June. 



Thompson (J. B.). Report of the Special Agent in Charge. 72('/>i. 

 Guam Agric. Expi. Sta., 1914, Wdshiuglo)!, D.C., 26th February 

 1915, pp. 7-18, 2 plates. 



An Aphid frequently attacks cucumber leaves in Guam and causes 

 much damage. The simplest control method, where plantings are in 

 close proximity to a line of pipe carrying a sufficient amount of pressure, 

 consists in training a stream of water upon the plants through a garden 

 hose fitted with a nozzle constructed for throwing a sohd stream. This 

 may also be applied to Aphids infesting okra plants. Okra also some- 

 times suffers from a lepidopterous larva, which bores into the young 

 seed pods. Egg-plants are frequently attacked by Aphids, and a 

 mealy-bug also occasionally occurs on them. Lettuces, peppers, or 

 carrots have no serious insect pests in Guam. Radishes are frequently 

 attacked bv the larva of Helhda nndalis, which defoUates them and 

 sometimes enters the root at the crown. This pest does not seem to 



