12 



Imported currant borer {Nigeria tipuUformis). — For a few years past the larva of this 

 moth has been injurious to the red currant busii in this State, appearing in this re- 

 gion from the middle to the last of the mouth of May. 



Garden tveb-worm (Eurycreon rantalis). — The most remarkable insect visitation of the 

 year to Colorado was the presence of this insect. The moths appeared in immense 

 numbers late in April, covering the plains and reaching well np into the mountains, 

 and embracing the greater portion of the State. * * * The first larvse were noticed 

 May 29 (then quite small) ; from this date to July 15, larvfe of all sizes were working 

 together, and were injurious as late as July 4. The cocoons were readily found in the 

 rubbish at the collar of the plants attacked. The larvse appear to be gregarious, as 

 they fed in numbers on the same plant, over which they spun an intricate web, along 

 ■which they traveled -with alacrity when disturbed. Bemedies : We made our first ap- 

 plication of Paris green June 1, using 1 pound of the poison to 100 gallons of water, 

 which proved to be very elfective and not injurious to the plant, but we had to make 

 a second application on the 20th of June, and finally on July 3, after which garden 

 plants which had been treated were not further troubled, although mature larvsB were 

 to be obtained for some days afterwards on fields of alfalfa. We used a hand ma. 

 chine to spray a 6-acre garden. 



Pea u-eevil (Bniclius 2)isi). — This weevil continues to damage field and garden jieas 

 considerably. Our seeds of all the varieties grown this season are affected more or 

 less. Bemedies: These insects usually remain in the peas all winter, so that if the 

 affected stock is kept over another season in tight vessels, the beetles are of course 

 destroyed. 



Soutliern cabbage butterfly {Pieris protodice). — The larva of this butterfly is the most 

 injurious of the cabbage caterpillars to the gardener in Colorado. It was present in 

 this State the past season in force, flitting over fields of cabbages in increased num- 

 bers over previous years. Of other cabbage worms we noted Pieris oJeracea, Plusia 

 hrassicce, and Ceramica picta, though not in numbers sufficient to cause much damage. 

 The latter species I have taken on the soft maple. Bemedies : Against these cater- 

 pillars we applied successfully, on July 26, the kerosene emulsion and Ougarth's 

 liquid tree protector. The latter is the more effective of the two, as it sticks to the 

 foliage better, and, while killing when it comes in contact with the caterpillar, it also 

 seems to render the plant obnoxious to insect life. 



False chinch bug (Nysius aiigusfatus). — This insect appeared in market gardens in 

 this vicinity last June for the first time. It first appeared on radishes, clustering in 

 large numbers in the shade of the leaves near the ground. It next attacked a field 

 of turnips, showing a preference for certain varieties, but avoiding all varieties of 

 the rutabaga. It also did some damage to cabbage and cauliflower, but confined 

 itself particularly to the two plants mentioned. Bemedies: This is by far the most 

 difiicult 'insect with which I have had to contend the past season, because of its rapid 

 movements and great numbers. 1 applied the kerosene emulsion, diluting the latter 

 with nine parts of water ; also applied Ougarth's liquid tree protector, and hellebore, 

 both as a powder and mixed with water. The first two are very effective whenever 

 the. liquid comes in contact with the insect, but, owing to their vast numbers and 

 ability to fly, only a small proportion of them could be killed at one application. 

 These insecticides were applied on July 26, August 3, 11, and 21. It would be desir- 

 able to burn all weeds and tops of vegetables, so as to afford these insects as few 

 hiding places as possible. 



Forest-tree insects. — Brief notes on tlie cottonwood beetle {Plagiodera 

 scripta), poplar borer (Saperda calcarata), Tortrix rosaceana, leaf-rolling 

 caterpillar {Cacoecia semiferana), elm-leaf caterpillar {Vanessa antiopa), 

 pear-tree slug {Selandria cerasi), Grapta interrof/ationis nud G.progne, 

 forest tent-caterpillar, elm ai)his, and Telea polypliemus. 



Miscellaneous insects. — Brief notes on Bhynchites bicolor, Systena mitis, 



