402 



If the soil should become infested, planting must be limited to the 

 few crops, such as cereals and leguminous plants, that are not seriously 

 attacked, a list of which is given. If plants of this class are used in a 

 carefully planned rotation for a three-year period, the pest will be 

 very decidedly reduced, so much so that potatoes may probably be 

 grown for a year. 



Chittenden (F. PL). U.S. Bur. Entom. The Potato Tuber Moth.— 

 15tli Bienn. Eept. Oregon State Bd. Hortic, Salem, 1919, pp. 105- 

 110, 4 iigs. [Received 5th July 1920.] 



The greater part of the contents of this paper on Phthorimaea 

 operciilella, Zell., has already been noticed [R.A.E., A, i, 102]. In. 

 addition it is advised that potatoes for seed should be sorted two weeks 

 after digging, and again two weeks later, and the uninfested tubers 

 placed in a moth-proof bin. The latter should be fumigated with 

 carbon bisulphide and inspected frequently. If any sign of infestation 

 appears they should be fumigated again. 



DupoRT (L.). Note sur les Chenilles perforantes du Riz. — Extract 

 from Bull. Econ. Indochine [sme loco], no. 134. January- February 



1919, 3 pp. MS. [Received 10th July 1920. J 



There are four principal species of moths the larvae of which tunnel 

 in the stems of rice plants in Indo-China and in fact throughout the 

 Far East. By far the worst of these is Sclioenohius incertellus, Wlk. 

 {bipunctifer, Wlk.), which causes serious losses each year ; Cyiaplialo- 

 crocis medinalis, Gn., has become sufficiently numerous at times to 

 cause severe damage in various parts of Tonkin , Chilo simplex, Butl., 

 is mainly a pest of maize, but occasionally attacks rice also ; Sesamia 

 inferens, Wlk., is very seldom a pest of any importance. Observations 

 at Cho-ganh indicate that other moth borers also occur, but only 

 occasionally appear in sufficient numbers to cause nuich trouble. 



S. incertellus has been dealt with in a previous paper [R.A.E., A, 

 vii, 519]. At Tonkin, the damage done by this species alone amounts 

 in normal years to 10 to 15 per cent, of the crop, and may sometimes 

 reach 40 to 50 per cent., the loss frequently being attributed tO' 

 atmospheric conditions. The only method of control that has been 

 tried with any success is hand-picking the infested stalks a short while 

 after blossoming. This is a tedious operation, and must be carried on. 

 over large areas to prevent re-infestation from neighbouring fields. 

 The same method will be tried next year on the same fields on the two 

 yearly crops, and will be followed by the removal and destruction of 

 the stubble in which those larvae that have escaped hand-picking. 

 occur. 



All the four moths mentioned also infest maize. The larvae are 

 parasitised to some extent by Hymenoptera, but these do not seem 

 to exercise mucli control. 



ZiMMERLEY (H. H.) & Smith (L. B.). A Study of the Cost of Spraying 



Ka,\e.— Virginia Truck Erpt. Sta., Norfolk, Bull. 30, 1st January 



1920, pp. 121-134, 1 fig. [Received 14th July 1920.] 



Kale, which is one of the most important crops produced in Eastern 

 Yii'ginia, is attacked with increasing severity by various insect pests,. 



