32 THE MONTHLY BULLETIN. 



Food Plants. — Citrus, azalea, Aspidhmi, crotons, dahlias, phlox, 

 verbena, pink, ferns, vines, cherry, lanrel, laurestinus, palms, Ficus 

 sps. Fellcea hastata, Liliacece, fuchsia, mango, begonia, cattleya, grape, 

 Norfolk Island pine, smilax. On citrus the fruit as well as the foliage 

 is scarred. 



Control. — Sprays recommended for pear thrips {Eiithrips pyri) are 

 also applicable for this pest, ])ut in spraying tender greenhouse plants 

 these should be weakened to two thirds normal strength. In spraying 

 for the greenhouse thrips on citrus trees, use the formulae recommended 

 for citrus thrips {Eutlirips citri). 



Fumigating may be employed if the greenhouses can be made reason- 

 ably tight, using one third to one half of an ounce of potassium cyanide 

 to every one hundred cubic feet of space, proceeding as directed for 

 orchard fumigation work. 



Natural Enemies. — Mites prey upon this species to a considerable 

 extent, but render little reliable aid. 



THE GRAIN OR STRAWBERRY THRIPS. 



Euthrips tritici Fitch. 

 (Fig. 29.) 



General Appearance. — Very minute, being from 0.029 to 0.031 of an 

 inch in length. The color is yellow, with orange-tinted thorax. 



Life History. — The eggs are very minute, globular in shape and 

 red in color. They are inserted within the tissues of the host and 

 hatch within a few days. The nymphs or young greatly resemble the 



Fig. 29. — The grain or strawberry thrips, 

 Euthrips tritici Fitcli. (After Folsom.) 



adults, and begin to feed at once. The principal damage is done to the 

 blossoms of the host. Strawberries especially suffer from their attacks. 

 According to Professor Quaintanee, the pistil is the portion of the 

 blossom destroyed. The winter is probably passed in the soil, as in 

 the case of the pear thrips {Euthrips pyri) . 



