Evaluation of Allorhogas pyralophagus Marsh (Hymenoptera: Braconidae) for the biological control of Diatraea spp. (Lepidoptera: Pyralidae) in sugar-cane in Guyana     

B. Dasrat  A. Rajkumar  C. Richards-Haynes  C. Quashie-Williams  D. Eastwood 《Crop Protection》1997,16(8):723-726

In 1989, a mass production and field release programme of Allorhogas pyralophagus Marsh (Hymenoptera: Braconidae) for the control of the Diatraea spp., particularly D. centrella (Möschler) (Lepidoptera: Pyralidae) in sugar-cane, was initiated by the Guyana Sugar Corporation. The programme was terminated in 1995 after the release of approximately two million adult parasites resulted in a mean field parasitism in Diatraea spp. larvae of only 0.22%. In contrast, 62% of Diatraea spp. larvae were parasitised in vitro as were 32% of larvae in young cane shoots exposed to A. pyralophagus in the laboratory. Neither Diatraea larvae in young cane plants caged in the field nor those recovered from Echinochloa polystachya (Kunth) Hitchc. and Paspalum virgatum L. around release fields showed any parasitism by A. pyralophagus. The reasons for the low rate of host acquisition outside the laboratory are not known, but it is clear that A. pyralophagus offers little prospect for significant control of Diatraea spp., particularly D. centrella in sugar-cane in Guyana.  相似文献   

Agro-morphological variability and genetic diversity in linseed (Linum usitatissimum L.) germplasm accessions with emphasis on flowering and maturity time     

Saroha  Ankit  Pal  Deepa  Kaur  Vikender  Kumar  Sandeep  Bartwal  Arti  Aravind  J.  Radhamani  J.  Rajkumar  S.  Kumar  Rajesh  Gomashe  Sunil S.  Sengupta  Abhishek  Wankhede  Dhammaprakash Pandhari 《Genetic Resources and Crop Evolution》2022,69(1):315-333

Genetic Resources and Crop Evolution - Assessment of genetic diversity and extent of trait variation among germplasm accessions facilitate the effective use of genetic resources for varietal...  相似文献   

Pattern of genetic inheritance of morphological and agronomic traits of sorghum associated with resistance to sorghum shoot fly, <Emphasis Type="Italic">Atherigona soccata</Emphasis>     

Riyazaddin Mohammed  Ashok Kumar Are  Rajendra S. Munghate  Anil Gaddameedi  Kavi Kishor Polavarapu Bilhan  Hari C. Sharma 《Euphytica》2018,214(2):32

Sorghum shoot fly, Atherigona soccata is an important pest of sorghum during the seedling stage, which influences both fodder and grain yield. To understand the nature of inheritance of shoot fly resistance in sorghum, we performed generation mean analysis using two crosses IS 18551 × Swarna and M 35-1 × ICSV 700 during the 2013–2014 cropping seasons. The F₁, F₂, BC₁ and BC₂ progenies, along with the parental lines were evaluated for agronomic and morphological traits associated with resistance/susceptibility to sorghum shoot fly, A. soccata. The cross IS 18551 × Swarna exhibited significant differences between the parents for shoot fly deadhearts (%) in the postrainy season. The progenies of this cross exhibited lower shoot fly damage, suggesting that at least one of the parents should have genes for resistance to develop shoot fly-resistant hybrids. Leaf glossiness, leafsheath pigmentation and plant vigor score during the seedling stage exhibited non-allelic gene interactions with dominant gene action, whereas 100 seed weight showed both additive and dominant gene interactions. Presence of awns showed recessive nature of the awned gene. Generation mean analysis suggested that both additive and dominance gene effects were important for most of the traits evaluated in this study, but dominance had a more pronounced effect.  相似文献   

Development of production management strategies for a long-duration rice variety: Rajendra Mahsuri—using crop growth model,DSSAT, for the state of Bihar,India     

Jha  Ranjeet K.  Kalita  Prasanta K.  Jat  Rajkumar 《Paddy and Water Environment》2020,18(3):531-545

Paddy and Water Environment - Increasing crop production is an inevitable demand of a current growing population all over the world. Implementation of best field crop practices potentially enables...  相似文献