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4 > Image 4 of Kentucky fruit notes, vol. 1, No. 17, June 1940

Part of Kentucky Agricultural Experiment Station

crown borer-free plantings or that all evidence on the beginning of egg lay- to plants are dug before egg laying ing. 'l`his is by the dissection of sti starts. For this reason other means female crown borers under a micro- l't of controlling this pest are needed scope. lf on a given date in February (tr ` and Dr. Ritcher is working on this or l\larch no females contain t`t1lly th 4 problem, developed eggs, it is good proot' that mt i Experiments are being carried out no eggs have been laid. On the other Ai ` ` by Dr. Ritcher using methyl bromide hand, if one or more crown borers gr _ which is a new chemical widely used contain full sized eggs then egg lay- in ` by nurseries for funiigating nursery ing can be expected whenever the re . stock to control insects such as the temperature is about 70 degrees l`, ra Japanese beetle. Shipments of straw- llsing this system, the writer in V berry plants known to be infested 1937 t`ound the iirst eggs laid at with crown borer eggs and larvae Princeton about March S. ln wits, have been sent to Dr. Ritcher for there was danger ot` eggs being laid i fumigation trials. If it is found that after March 10. Beginning last year, the eggs and young borers in these Mr. Armstrong collected crown borers , plants are killed without injury to at intervals in western Kentucky Sl the plants should be of great impor- patches and sent thein iced to the I, I tance to the strawberry industry. writer in Lexington for dissection, N , Should this work prove practical it Last year (193ili there was danger S] would be a comparatively simple of egg laying after March 7. In step to establish fumigation sttttions This yt-ar. An. lxrnistrong and ins H lll thi? $tl3Wb11'Y $Yl0ll$ l\'hl` helpers began collecting crown borer I- gl'0WI`S lll1tS adults early in March. The tirst col- I] fllmigiitd in 01dl to hl' SSl1111lC lection made at Princeton on March 4 u that Olily CYOWII b0l`1`fl` D1i1HtS ?1l` showed only slight egg development. , billg set. A second collection made March lit C _ The dVl0DIllllt of this W01`k is and 20 included females from both being watched with 21 g1`i1t deal of Benton and Princeton patches, but t, interest and with high l10Des by a none contained fully-developed eggs. U _ ` number of strawberry growers. l\larch 22, Mr. Armstrong gathered 42 H . crown borers at Princeton. The iirst S i CROWN BORERF}-{EE BERRY female containing fully developed I PLANTS eggs was found in this shipment. t ` By P, 0, RITCHER, and W_ D_ ARM- Shipments of over 200 crown borers ( STRONG from the Magruder farm near Keyil , In Work carried on at Paducah and made on March 27 and April 1 and a > , princeton in 1937 it was Shown that shipment from Princeton on April 1 growers could {me St,.awb1.ry plants all contained females with fully- ( _ of CTOWI1 borer by digging and clean- developed 9ggS , V ing plants before egg laying began. From the above evidence, it was i i j In general, the dead line for digging concluded that crown borer egg lay- i ` Q " plants in western Kentucky was set ing was delayed in 1940, beginning t - , BS 3b0l1t March 1, but the date varies about the third week in March at from year to year depending upon {no Princeton and Paducah. It was not g season. Each year the time has been SMG to dig SU`1l'l>l`1`y Dlilllls lll ` ' 10heCkd and growers advised by western Kentucky after l\iarch 21 ~ : letter, radio and newspaper of inn since there was a good possibility Q i ' Dl0pI time to stop digging plants, that some plants would contain l 1 Since it is impossible to ilnd the <*l0Wll il0l0l USES- first egg laid, a way was worked out On the basis of thc 19-10 findings, that would give circumstantial letters were sent. by Mr. Armstrong 4 mjit