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11 > Image 11 of Kentucky farm and home science, vol. 1 No. 2 fall 1955

Part of Kentucky Agricultural Experiment Station

season, was estimated. This was done b determinin it ave the best kill of a lrids and cucumber beetles; Y 3 P the number of worms acquired by worrn-free calves the poor yield in 1954 was the result of severe burning 8 which were allowed to graze for short periods of time and stunting of the plants by the 2.5 percent chlor- Q at appropriate intervals with each of the test groups. thion dust. Because of toxicity to the plants, the 1 A summary of the observations for the year shows chlorthion dust was reduced in concentration, and in I that the treated animals ac uired onl onethird to one treatment the 1.5 ercent chlorthion dust was A (1 Y P one-half as many worms as the untreated or control put on after the first three dustings were made with group. In addition, the treated animals made con- 3 percent purified DDT. R sistently greater weight gains which indicated bene- Weight Of fruit % Difference In 5, ficial action from medication in the treated group. 195$f<1mfS i0CS ffvm Check . . , . 1.5% Chlorthion dust .................. 947 4 , Although these results eI11`|Ot conclusive, surprisingly 3% Purified DDT dust 17551 + 57 high levels of worm infection were found. More data :3% Purified DDT dust and E . , as . 1.57 Chlorthion dust .............. 1,168 l- 18 on. this problem are being accumulated by repeating O45%PuriHCd DDT spray 17549 + 57 , this study during the present Season. 0.16% Endrin spray ...................... 1,625 + 66 : 0.16% Lindane spray .................... 1,122 + 14 Untreated check ............................ 988 __,_ I e Cucumber Insect The . _ . . . . plots receiving the lrndane and endrin dusts 1 yielded less than that receiving the DDT dust. On g the other hand, the lindane and endrin dusts con- . . tolled aalrds oe effe t` el tl; tl e DDT l t =1 Pests mclude striped and _ I I III I, YC IY I IIII I . S although not so eflectrvely as the chlortlnon dusts. * SP0tt(I btlSs {163% btlS The plot sprayed with endrin outyielded that sprayed * aphids and pjcklg WQTHIS with DDT. The lindane spray burned and stunted ` the young plants, resulting in lowered yields. There RY RICHARD THURSTON was no difference in yield between the plots sprayed ii y p p _ _ p p `. or dusted with purified DDT. A _Im _IIIIIIIbI OI IIIWCI8 IttICk Cucumbu I)IuIt Because many of the insecticides effective against or starting with the planting of the seed and continuing insects ,ltt_1CkiuU Cucurbits UG ,1150 Very mjurious to .4 through the harvest period. For this reason a regular Some CuCm_bitSH(_1d ind hbm__1tOl_y tcgts wom com ,5 WGQIIIY IIISII?II;II SCIIGIIIIIEfISHIIISSfY IO I`O"I'1E1II` ducted during the past two years to discover some IIIII IEIS OI PI L5 5I;*_II I1 ml UIIUCI y' I6 of the factors contributing to tlns toxicity towards EPI? IIIT"I}IIIE IIT I Ii *IIIPiI_ {IIII spite; IIIIIIIf plots. Several insecticidal dnsts were applied to seed- I I IIII _I IGGI eh IPIII5 IIII_PI 'IIII* ling cucurbits in 1954. The niost toxic materials in we IIIFl"I`1i ISII`IgCI3" IB III_ *II`IS {III III SIIIIIG Y*II` descending order of toxicity were 3 percent chlortliion, I} f}IIOIIgI $IIIIl( 5) [$0Of PIOICIIIOII {III? 2 percent chlorthion and 4 percent malathion. The 1 IIlIIIIIII IGI IFII GS II Ii IIEG rffve IgIIIII EIPIII following materials caused no plant burning: 3 per- IIIi IIIIYIIII CIIIIIIII II Em ;IIIIISf _ H cent purified DDT, 1.5 percent lindane, 1.5 endrin, I r II 10 III iusb WI HSI; {III EOIS OE PIflIIIg and 2.5 percent heptachlor. A negligible amount of CIICIIIII wl? at I I6 *lIIIIIIIII IIIIOII aI_III' ac I ( IISI burning resulted from 1 percent chlorthion and 1 per- 6. was applied at weekly intervals, starting when the CGM P,u_,1thi(m All the Vwietieq Of Cucumbcrs {md 3. S?I_IIIIgS1""`I`lIIIiIIIIIg IIII"IIIgII IIIQ gI`OIIIII fIIII CO"' bnttercnp, scallop, crookneck, lrnblrard and cnsliaw * IIIIIIIIIf* IIIIIIgI IIIVbI squashes were badly burned by the most toxic ma- 1VQish of fruit % Diffwmlcc terials, but the zucchini squash, cantaloupe and water- 5 1954 dns! Iiezilirzerrls tn ounces from check I _ _ I I _ f_ f_ . . _ {_ 3% Pmmcd DDT 2384 + 32 me on were tl most ree rom rn]ury rom any of the 1.5% Endrin .................................. 2,3453 + So dusts. Other field and laboratory tests with chlorthion w '! and malathion dusts and sprays showed that seedling ..4.r O ........ ...... ....... ............. ..4, ( l . Q, 4% Malathionl ................r............... 1,779 2 cucumber plants were more susceptible to insecticrdal , injury than plants that had started to vine; that wet 5 Untrcatcd check ............................ 1,809 .... '_ A _ ,. _ . _ . . _ plants were more easily burned by insecticides than * In 1955 the more effective insecticides were tested dry ones; and that activated carbon added to the spray a rain but several of them were used as s rravs instead material could eliminate or reduce the rhvtotoxicitv fp 1 . _ 1 . . * of dusts. The chlorthion dust was used again because of chlorthion. I W -. _ KrsNrUcr