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Overall progress 3 Early methane sulfonate (EMS)-induced micromutation in a tall indica rice 4 Improved White Ponni released in Tamil Nadu

Agronomic characteristics 5 No first internode found in Nepalese varieties 5 Screening for dormancy in 39 rice varieties 6 Effect of gamma-radiation on germination and seedling growth

Disease resistance 7 Reaction of short-duration rice varieties to leaf yellowing

Insect resistance 7 Resistance to whitebacked planthopper (WBPH) at flowering stage 8 Resistance of recommended and traditional varieties to gall midge (GM) 8 ET6012 (ACM8) a promising gall midge-resistant rice culture 8 Genetic evaluation against rice brown planthopper (BPH) at Cuttack 9 Breeding japonica lines with brown planthopper (BPH) resistance 9 Varietal reaction to thrips 9 Sources of resistance to green leafhopper (GLH)

Adverse soils tolerance 10 Selecting for alkali soils

Deep water 10 A simple technique for measuring internode elongation of deep water rice

Hybrid rice 11 Relation of cross seed set and fertility in rice hybrids 13 Diversification of cytoplasmic male sterility in rice 13 Heritability of compact panicle and stigma color 13 Root systems in hybrid rice 14 Isolation of fertility restorers and maintainers for cytoplasmic genetic male

sterile line

Others pests 14 Reaction of rice varieties to root nematode Hirschmanniella spp. in the field

Diseases 15 Bacterial sheath brown rot (BSBR) in Latin America 16 In vitro response of maize and rice isolates of Rhizoctonia solani to

antibiotics and fungitoxicants 17 Serological identification of tungro viruses in isolates from 4 states of India 17 Horizontal and vertical spread of rice sheath blight (ShB) 18 Chemical control of brown spot (BS) and sheath rot (ShR) in Tamil Nadu 18 Reaction of tungro (RTV) isolates on Taichung Native 1 19 Nonrice hosts of the causal agent of bacterial sheath brown rot (BSBR) in

Latin America 20 Weeds as alternate hosts of Thanatephorus cucumeris (Frank) Donk in

Cuba 20 Evaluation of decamethrin concentrations for tungro disease and vector

control 21 Evaluation of some new synthetic pyrethroids for tungro (RTV) disease and

vector control 21 Relation between rice sheath blight (ShB) and yield

Insects 22 Alang-alang gall midge potential as an alternate host for parasitoids 23 Response of leaffolder (LF) Cnaphalocrocis medinalis G. to extracts of

resistant Oryza sativa and O. brachyantha 24 Effects of flooding on insect pests and spiders in a rainfed rice environment 25 Effect of ratoon rice crop on populations of green leafhopper Nephotettix

virescens, brown planthopper Nilaparvata lugens, whitebacked plant- hopper Sogatella furcifera, and their predators

Contents GENETIC EVALUATION AND UTILIZATION 27

27 28 28

29 30 30 31

Suitability of ratoon rice as host to insects Snail predators of the rice caseworm Modeling for size of damage-causing generation of rice leaffolder (LF) Brain cells and chromosomes of the brown planthopper Nilaparvata lugens

Parasitoids of the rice gall midge (GM) in Indonesia Some new insect pests of rice in Uttar Pradesh, India Predators of rice caseworm Major insect pests of rice in Cuba

(Stl)

31 First meiotic chromosomes of male Nephotettix malayanus 32 Population dynamics of the brown planthopper (BPH) in irrigated lowland

33 Host range and biology of three rice caseworms 34 Chromosomes of the primary spermatocytes of Nephotettix nigropictus

35 Incidence of the yellow stem borer (YSB) on deep water rice in the Mekong

35 Resistance of rice accessions to green leafhopper (GLH) Nephotettix

36 Insect and vertebrate pests of deep water rice in the Mekong Delta, Vietnam 36 Survival of adult Nephotettix virescens in test tube

areas of West Java, Indonesia

(Stl)

Delta, Vietnam

virescens and rice tungro virus (RTV)

Weeds 37 Integrated weed control in upland rice

MACHINERY DEVELOPMENT AND TESTING

37 Developing an animal-driven pump to draw groundwater 38 Inverted-T multicrop seeder for rice-based cropping system

PEST CONTROL AND MANAGEMENT

SOIL AND CROP MANAGEMENT

39 Effect of pretransplanting submergence and green manure on yield and

39 Response of rice to different N fertilizers 40 Integrated organic and inorganic nitrogen fertilizer in lowland rice 40 Evaluating rate, timing, and method of N application using tracer technique 41 Response of flooded rice to different levels and placement methods of urea

42 Response of rainfed rice to farmyard manure placement and soil

42 Improved management of urea in rice 43 Evaluation of urea forms in thaladi rice (IR20) 43 Response of Magsanaya upland rice in an acidic upland area to lime and

sodic soil improvement

and urea supergranule

compaction

fertilizer

RICE-BASED CROPPING SYSTEMS

43 A suitable cropping system for Thambiraparanj region in Tamil Nadu 44 Organic manures as a nitrogen source in a rice - wheat rotation 45 Effect of Sesbania green manure on water management and yield of

45 Barley as a second crop in rice areas of Kizilirmak Valley, Turkey 46 Irrigated peanut following rice in Konkan, India 46 High productivity varietal combinations in a rice - wheat rotation in

lowland rice

Chhattisgarh, India

ANNOUNCEMENTS

47 Reorganized GEU rice team in Taiwan

47 Other IRRI scientists recognized 47 Classic soils work recognized

47 Amir Khan /international Inventor

Guidelines and Style for

IRRN Contributors

Articles for publication in the International Rice Research Newsletter (IRRN) should observe the following guidelines and style.

Guidelines Contributions should not exceed two pages of

double-spaced typewritten text. Two figures (graphs, tables, or photos) may accompany each article. The editor will return articles that exceed space limitations.

Contributions should be based on results of research on rice or on cropping patterns involving rice.

Appropriate statistical analyses should be done.

Announcements of the release of new rice varieties are encouraged.

Pest survey data should be quantified. Give infection percentage, degree of severity, etc.

Style For measurements, use the International

System. Avoid national units of measure (cavan, rai, etc.).

measure when they follow a number. For example: 20 kg/ha, 2 h/d.

Express yield data in tonnes per hectare (t/ha). With small-scale studies, use grams per pot

Express time, money, and common measures in number, even when the amount is less than 10. For example: 8 min, $2, 3 kg/ha, 2-wk intervals.

Write out numbers below 10 except in a series containing 10 or higher numbers. For example: six parts, seven tractors, four varieties. But There were 4 plots in India, 8 in Thailand, and 12 in Indonesia.

Write out numbers that start sentences. For example: Sixty insects were put in each cage. Seventy-five percent of the yield increase is attributed to fertilizer.

Place the name or denotation of chemicals or other measured materials near the unit of measure. For example: 60 kg N/ha, not 60 kg/ha N; 200 kg seed/ha, not 200 kg/ha seed.

Use common names not trade names for chemicals.

The US$ is the standard monetary unit in the IRRN. Data in other currencies should be converted to US$.

When using acronyms, spell each out at first mention and put the specific acronym in parentheses. After that, use the acronym throughout the paper. For example: The brown planthopper (BPH) is a well-known insect pest of rice. Three BPH biotypes have been observed in Asia.

Abbreviate names of months to three letters: Jun, Apr, Sep.

Define in the footnote or legend any nonstandard abbreviations or symbols used in a table or figure.

bibliography.

Abbreviate names of standard units of

(g/pot) or g/row.

Do not cite references or include a

Genetic Evaluation and Utilization OVERALL PROGRESS

Ethyl methane sulfonate (EMS)- seeds of Dahar Nagra, a tall indica induced micromutation in a tall variety in 1% aqueous, freshly prepared, indica rice nonbuffered solution of EMS for 4, 6,

and 8 h. Number of tillers per plant, E. H. Mallick, Rice Research Station, Bankura 722101; N.G. Hajra and S.G.

panicle length, number of filled grains

Hajra, Regional Rubber Research Institute, per panicle, 1000-grain weight, and yield

Agartala, Tripura (West), India per plant were reduced in the M 2 (Table 1) and M 3 (Table 2). Weight of

We induced mutations in quantitatively 1,000 filled grains increased after EMS inherited traits of rice by presoaking treatment.

Table 1. Mean and estimates of genetic parameters of 5 quantitative characters in the M 2 of Dahar Nagra after EMS treatment. Burdwan University Crop Research Farm, India.

Mean of Genotypic Genotypic Heritability Genetic

Treatment genetic coefficient (broad sense) character variance

advance of variation (%) percentage (% of mean)

Tillers (no./plant) Control 21.38 0 0 0 0 4 h 17.38 1.048 5.8 15.4 1.82 6 h 14.1 1 3.255 12.7 24.2 12.94 8 h 12.94 5.377 17.9 27.1 19.19

Panicle length (cm) Control 28.81 0 0 0 0 4 h 25.33 0.090 1.1 5.5 0.57 6 h 23.66 0.564 3.1 18.4 2.79 8 h 23.07 0.998 4.3 22.8 4.26

Filled grains (no./panicle) Control 160.88 0 0 0 0 4 h 147.33 3.014 1.1 3.9 0.4 7 6 h 139.22 1.844 2.0 8.6 1.20 8 h 134.27 11.700 2.5 11.4 1.76

Weight of 1000 filled grain

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